Choosing the right rug for your horse sounds straightforward until British weather gets involved. One morning it's a frost, by lunchtime it's mild and sunny, and by evening you're peering at a forecast that says "chance of sleet."
Most horse owners have been there, wondering whether to reach for the medium or the heavy, whether to add a neck, and whether their cob really needs anything at all.
We designed this guide for you, to take the guesswork out of rugging. We cover everything from what the gram weight on a rug actually means, to a practical UK temperature chart cross-referenced by clipping level, how your horse's breed and age affects the equation, when to add a neck cover or liner, and how to tell whether your horse is comfortable in the rug they have on.
Whether you are new to horse ownership or just want a reliable reference to check against, there is something here for every yard situation.
What does rug fill weight actually mean?
Every horse rug that offers warmth will carry a gram weight on the label. This refers to the amount of polyester fill (measured in grams per square metre) stitched between the inner and outer layers of the rug. The higher the gram weight, the more insulation the rug provides.
As a general reference:
- 0g (no fill / rain sheet) protects against wind and rain without adding any warmth. Useful for hardy, unclipped horses that simply need to stay dry, or as a summer shower sheet.
- 50g to 100g (lightweight) offers a small amount of warmth alongside weather protection. Well suited to mild-to-cool conditions or as a base layer under a heavier outer.
- 150g to 200g (mediumweight) is the most-used weight for much of the UK autumn and winter, covering a wide range of conditions for average-type horses.
- 250g to 300g (heavyweight) provides significant warmth for cold, wet winters and is the standard for fully or hunter-clipped horses in freezing or near-freezing conditions.
- 350g to 400g (extra heavyweight) is reserved for extreme cold or very fine, clipped horses that struggle to hold condition in harsh winter weather.
It is worth knowing that these definitions are not universal. Some brands class 150g as mediumweight, while others only reach that label at 200g. If you are comparing rugs across brands, the gram number is always a more reliable guide than the category label alone.
Browse our full range of horse rugs, including turnout rugs and stable rugs.
UK temperature and rugging chart by clipping level
There is no single official UK rugging standard, but most guidance from the BHS, BETA and equine vets clusters around similar temperature bands. The chart below is designed as a starting point for turnout rugs. It cross-references temperature with clipping level, because how much coat your horse is carrying has just as much bearing on rug choice as the thermometer outside.
Read it as a baseline, not a rulebook. Your horse's breed, age, body condition and the exposure of the field all matter too, and we cover those adjustments in the sections that follow.
How to use this chart: If the weather is wet and windy, lean one step warmer than shown. In dry, still conditions, you may be able to stay at the lower end of each range or go one step lighter. Adjust for your individual horse as described below.
Above 15°C
| Clip level | Recommended rug (turnout) |
|---|---|
| Unclipped | No rug |
| Trace-clipped | No rug; 0g rain sheet only in persistent heavy rain |
| Hunter-clipped | No rug; 0g if prolonged rain or horse is a fine-coated type |
| Fully clipped | No rug or 0g sheet; veterans and TBs may need 50g on cold evenings |
10 to 15°C
| Clip level | Recommended rug (turnout) |
|---|---|
| Unclipped | No rug; 0g if cold, persistent rain or exposed field |
| Trace-clipped | No rug for hardy types; 0g or 50g if wet and windy |
| Hunter-clipped | 0g rain sheet as standard; 50g to 100g in persistent rain or wind |
| Fully clipped | 50g to 100g lightweight turnout |
5 to 10°C
| Clip level | Recommended rug (turnout) |
|---|---|
| Unclipped | No rug or 0g; 50g to 100g for finer types or cold rain |
| Trace-clipped | 0g to 50g baseline; 50g to 100g if wet, windy or horse is lean |
| Hunter-clipped | 100g to 150g lightweight; 50g to 100g for hardy types in sheltered fields |
| Fully clipped | 150g to 200g; lower end for hardy or hardworking horses, upper end for TBs and veterans |
Browse our lightweight turnout rugs, including 50g turnout rugs and 100g turnout rugs.
0 to 5°C
| Clip level | Recommended rug (turnout) |
|---|---|
| Unclipped | 0g to 100g depending on type; hardy natives may cope without a rug in dry conditions down to around 3°C |
| Trace-clipped | 50g to 100g; 100g to 150g if exposed, wet or an older horse |
| Hunter-clipped | 150g to 200g mediumweight; consider adding a neck in persistent rain |
| Fully clipped | 200g to 300g; towards 250g to 300g for TBs, older horses or very open, exposed fields |
Browse our mediumweight turnout rugs.
Below 0°C (down to approximately -5°C)
| Clip level | Recommended rug (turnout) |
|---|---|
| Unclipped | 100g to 150g for most horses; 50g to 100g for hardy natives in good condition and dry weather |
| Trace-clipped | 100g to 150g; 150g to 200g if exposed, lean or older |
| Hunter-clipped | 200g to 300g with neck; towards 300g for fine or veteran horses in strong wind chill |
| Fully clipped | 300g to 400g heavyweight with neck; a 100g liner under a 200g or 300g outer is a practical alternative |
Below -5°C
These conditions are relatively rare across much of the UK and typically short-lived, but they do arrive. Most fully clipped horses at grass will need a total of 350g to 450g warmth, whether from a single heavyweight or an outer rug plus liner combination. Hardy unclipped natives in good condition often still manage in 100g to 200g, particularly in dry cold.
The risk of over-rugging is every bit as real as under-rugging at these temperatures.
Browse our heavyweight turnout rugs and under rugs and liners.
Adjusting for your individual horse
The chart above is built around an average, healthy, adult horse in reasonable body condition. Several factors will push you lighter or heavier than those baselines.
Native breeds and good-doer cobs are bred for cold, wet climates and typically carry more body fat and a denser winter coat than finer types. Many can go comfortably without a rug down to low single digits if unclipped, healthy and with access to shelter and forage.
Over-rugging good-doer natives is one of the most commonly cited horse welfare concerns in the UK: a heavy rug means the horse burns fewer calories staying warm, which compounds weight issues and raises the risk of laminitis.
As a rule, aim for one step lighter than the chart if your horse is a native or cob in good condition, and never leave them shivering, but do resist the urge to pile rugs on.
Thoroughbreds, Arabs and other fine-coated types lose heat more quickly due to thinner skin, lighter coats and less subcutaneous fat. These horses often need one step heavier than the chart at any given temperature, especially when clipped or living out full-time.
Warmbloods and sport horses sit somewhere between the two. In regular work at a moderate clip, many follow the chart broadly. At a high trace, chaser or full clip they often need TB-style rug weights, particularly when lean or in hard work.
Veteran horses may struggle more to regulate temperature as they age, especially if they have dental issues reducing their ability to chew enough forage, or arthritis limiting how much they move.
Many veterans need rugging a little earlier in autumn and may benefit from an extra 50g to 100g compared to their younger self at the same temperature. Monitor body condition through the rug regularly, as it is easy to miss weight loss under a thick rug.
Horses in poor condition, underweight or recovering from illness have less fat insulation and fewer reserves to burn for warmth. These horses generally need one band more than the chart average, particularly in cold, wet or windy conditions.
If you have a horse in this situation, work closely with your vet or equine nutritionist rather than relying on a chart alone.
Overweight horses and ponies are well insulated naturally and often benefit from being lightly rugged through winter to allow controlled, safe weight loss. Heavy rugging of overweight ponies in particular prevents natural calorie use and is strongly linked to obesity and laminitis risk in spring. Aim for "comfortably cool" rather than toasty.
Young horses in their first winter are individual. A healthy, well-grown native youngster often copes with very light rugging or none, while a fine-bred youngster or weanling may need closer to adult TB-style care. Either way, avoid over-rugging young horses and give them room to move and develop their natural thermoregulation.
Horses with Cushing's disease (PPID) need individual assessment. Those with poor coat, weight loss or who are clipped often need more rugging, while overweight PPID horses with thick, retained coats may actually need less. Monitor closely and involve your vet in rugging decisions alongside any medication management.
Stable rugs vs turnout rugs: do the weights work the same way?
In short: the gram weight is measured the same way, but a 200g stable rug and a 200g turnout rug do not always feel identical to the horse. The outer fabric, construction and environment all play a role.
Turnout rugs have waterproof, wind-resistant outer shells that block wind chill effectively. This can make a 200g turnout feel warmer in practice than the same fill in a breathable stable rug, particularly on a breezy day. Conversely, in a draughty barn, a stable rug offers no wind protection, so the horse may feel colder than the fill number alone suggests.
A practical way to think about it: use similar ballpark fill for stable and turnout at the same temperature, then adjust one step up or down depending on how exposed your stable is and how active your horse is outside.
A horse moving freely in a field generates warmth through exercise, while one standing still in a small stable overnight needs its rug to do more of the work.
Common mistakes to avoid include matching weights automatically without considering the environment, leaving muddy turnout rugs on in the stable (which reduces breathability and increases rub risk), and not dropping rug weight when bringing a horse from a cold, windy field into a warm, enclosed barn.
Browse our lightweight stable rugs, medium weight stable rugs and heavyweight stable rugs.
Neck covers: when to use one and what to expect
A neck cover protects one of the most heat-exposed areas on a horse - particularly important when the horse has been clipped, is a fine-coated type or is turned out in cold, driving rain.
In terms of warmth, a well-fitted, filled neck cover adds roughly half a step of overall warmth compared to the same rug without neck coverage. It is not a full substitute for stepping up a whole weight band, but it makes a real difference in wind and heavy rain.
Neck covers are particularly worth considering for:
- Horses with a full, hunter, chaser or high trace clip (the natural insulation on the neck is gone or significantly reduced)
- Thoroughbreds and other fine-coated breeds turning out in cold, wet weather
- Veterans and poor-doers losing heat quickly from the neck and shoulders
- Horses living out 24/7 in very open, exposed fields
For hardy, thick-maned natives and good-doer cobs, use neck covers more selectively. Thick manes can trap heat under a neck cover and lead to mane rub, so reserve them for genuinely cold or wet spells rather than using them as a default.
There are a few types worth knowing about. Integrated or combo necks are permanently attached and cannot be removed if the day warms up. Detachable necks offer more flexibility: add them for a cold snap, remove them in milder conditions.
High-neck or "wug" styles raise the neckline over the shoulders without fully enclosing the mane, which suits some conformation types and reduces rub risk.
Browse our neck covers.
Rug liners and layering: how to build warmth flexibly
Liners are purpose-designed inner rugs that clip or velcro into a compatible outer rug to add a layer of insulation. They are cut slightly shorter and shallower than the outer so they do not interfere with surcingles or leg straps, and they attach securely at front and back to prevent slipping.
The warmth of a liner adds directly to the outer rug fill. A 100g liner under a 200g turnout behaves broadly like a 300g rug; a 200g liner under a 200g outer gives roughly 400g total. Most liner systems offer 0g (mesh or fleece, for coat protection and wicking), 100g and 200g options, with some premium systems going up to 300g or more.
Layering is particularly useful in changeable British winters. A 0g or 100g turnout paired with a 100g and a 200g liner can cover most conditions from cool autumn drizzle through to a near-freezing cold snap, without needing to own three or four separate outer rugs. It also lets you fine-tune warmth as the season progresses and your horse's clip or condition changes, simply by swapping the liner rather than replacing the whole rug.
A couple of important practical notes. Always use a liner that is designed to work with your outer rug, ideally from the same brand and range, so the attachment points align correctly.
Stacking an ordinary stable rug under a turnout is not recommended, as mismatched straps can slip, twist and cause pressure rubs. And always check the horse's temperature after adding a liner: the numbers add up on paper, but individual horses vary, so feel behind the elbow and at the withers to make sure the combination is right.
Browse our under rugs and liners.
How to tell if your horse is too hot or too cold
The most reliable way to check whether your horse is comfortable is to slide your hand under the rug at the withers and behind the elbow. The skin and coat should feel warm and dry.
Hot, clammy or damp skin means the rug is too heavy or the conditions are warmer than expected. Cold skin or a fluffy, raised coat means the horse is working hard to stay warm.
Signs your horse is too warm:
- Damp or sweaty patches under the rug, especially along the neck, behind the ears and over the shoulders
- Rug lining that feels warm and steamy when lifted
- Restlessness in the stable or field, irritation with the rug, biting or rubbing at it
- Lethargy, dull expression or reduced appetite in more severe cases
Signs your horse is too cold:
- Cool or cold skin under the rug, coat hairs standing on end
- Shivering, which means the horse is already working hard physiologically to maintain temperature
- Tucked-up belly, tight abdominal muscles, tail clamped in
- Reluctance to move away from shelter, huddling with companions
If you find any of these signs, make a small change rather than a dramatic one. Drop or add one rug weight, or remove or add a neck, then recheck in an hour. Small adjustments are always safer than swapping between extremes.
It is worth noting that UK vets and welfare organisations consistently point to over-rugging as a bigger and more widespread welfare problem than under-rugging, particularly for native breeds and good-doers on rich grazing.
The BHS notes that horses can generally generate warmth through movement and forage more easily than they can cool down when trapped under a heavy rug. If in doubt and your horse is in reasonable condition with access to shelter and forage, err on the slightly cooler side.
When to rug: the UK seasonal rugging calendar
Rugging decisions should follow the horse and the thermometer, not the calendar. That said, most UK yards follow a recognisable pattern across the seasons.
Late September to October is when many horses at grass with a trace or hunter clip start to need light rugging. Once nights sit consistently around 10 to 12°C, particularly with rain and wind, a 0g to 100g lightweight turnout is usually appropriate.
The most common mistake at this time of year is reaching for a mediumweight too soon or leaving any rug on through warm, sunny autumn days. A horse that was fine at 7am may be genuinely too hot in the same rug by 2pm.
November into December sees temperatures dropping more consistently and mediumweights coming into regular use. Hunter and fully clipped horses in particular are often in 150g to 250g through this period, stepping up towards 300g as hard frosts arrive. Trace-clipped and native horses typically remain a step lighter throughout.
December to February is peak heavyweight season for clipped and finer horses in the UK. Fully clipped horses at grass in below-freezing conditions will often need 300g or more, either as a single heavyweight or a medium outer with a liner.
Hardy, unclipped natives in good condition frequently need far less than owners assume, even in single-digit temperatures.
March and April require flexibility in both directions. Most horses start stepping back down through the weights as days lengthen and temperatures lift, with heavyweights usually packed away by late March in an average year. However, late cold snaps are common and can catch owners off guard. A clipped or fine-coated horse left in a 0g rain sheet when a northerly brings rain and 2°C conditions in April can become genuinely cold.
Keep a lightweight or medium within easy reach until May.
May to August most horses are unclipped and rugging is largely limited to fly protection. Very elderly, underweight or fine-coated horses may still benefit from a lightweight on cold, wet summer nights, but for the majority the priority shifts from warmth to managing flies and sweet itch.
Browse our no-fill 0g turnout rugs and horse rug sale for end-of-season value.
Rug fit and preventing rub marks
A rug that fits well is far less likely to cause rub marks than one that is the wrong size, regardless of how well made it is. Most rug rubs occur at the shoulders, chest and withers, where the rug moves constantly as the horse walks and grazes.
Clipped horses and TBs are most susceptible, but any horse can develop rubs from a poorly fitting rug.
When trying a new rug, run through these checks:
- You should be able to slide a flat hand comfortably inside the chest area without pinching
- The back edge should finish just past the top of the tail, not midway down the hindquarters
- Check the neck opening when the horse grazes: it should not pull tight or cut in across the point of shoulder
- Cross-over surcingles should allow a flat hand between strap and belly but not hang loose enough to twist
- Walk the horse and let it graze briefly with the rug on, then recheck the shoulder and wither area for any signs of pulling or pressure
If your horse is prone to shoulder rubs, an anti-rub vest or shoulder guard worn under the rug creates a smooth, slippery layer that allows the rug to glide rather than drag against the coat. These are particularly useful for clipped horses and fine-coated types through winter.
A lightweight silky liner worn under any turnout or stable rug serves a similar purpose across the whole body, and has the added benefit of keeping the outer rug cleaner.
If a rug consistently causes rub marks despite correct sizing and adjustment, it is worth considering whether the cut suits your horse's conformation. Some horses need a broader shoulder cut, a higher wither clearance or an extended back length.
A rug that fits one horse perfectly may cause rubs on another horse of the same measured size due to differences in shape.
Your questions answered
What gram weight is a medium weight horse rug?
Most UK retailers and brands class 150g to 250g as mediumweight, with 200g being the most common mid-range fill. Some brands only use the "mediumweight" label from 200g upwards, so always check the gram weight rather than relying on the category name.
Is 100g a lightweight rug?
Yes. Most rugs between 50g and 150g are described as lightweight, with 100g sitting in the middle of that range. A 100g rug provides a modest amount of warmth and is suitable for clipped horses in mild, cool conditions or as a base layer under a heavier outer.
What weight rug does a fully clipped horse need?
This depends on the temperature, but as a guide: at 10 to 15°C a fully clipped horse typically needs a 50g to 100g turnout, at 5 to 10°C around 150g to 200g, at 0 to 5°C around 200g to 300g, and below freezing a 300g or heavier combination with a neck cover. Always adjust for how fine or hardy your horse is.
Can I put a stable rug under my turnout rug for extra warmth?
It is better to use a purpose-designed liner rather than a standard stable rug. Liners are cut specifically to fit under an outer rug and attach securely to prevent slipping and rubbing. Stacking unrelated rugs can cause straps to tangle, pressure points to develop and the whole combination to shift uncomfortably during turnout.
Whether you are building a full rug wardrobe for a newly clipped horse or simply trying to work out which weight to put on tonight, we hope this guide gives you the confidence to make the right call.
If you need any help choosing, our team is always happy to advise. Browse our full range of horse rugs or explore by weight and type below.
