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One K horse riding helmets boast the perfect synergy between advanced technology and aesthetically pleasing design. With enough features to appeal to those seeking everything an equestrian helmet could possibly offer wrapped in a package that traditionalists can appreciate One K has the best of both worlds. The One K Defender Air uses a built-in finger pump and air channels in the liner to offer the most customized fit available in any equestrian helmet on the market today! Certified to ASTM and CE EN standards.