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One K Helmets offer exceptional design, fit and quality. Extremely popular in the US, these stylish horse riding hats are now available in the UK with certification to ASTM, VG1 and PAS105 standards making them suitable for use post 2016 rule change. These OneK Helmets offer superb fit with huge versatility; a small shell will fit an extra small through to a medium liner whilst a large shell will fit a large through to an extra large allowing you to easily adjust the fit on your One K Helmet. Many of our riders note the similarity to their old favourite Gatehouse helmets and question the fit of the One K Helmets; these hats fit just the same...you could argue they may even be comfier!