One K is built around a single helmet family, the Defender, offered in finishes for schooling and the show ring. The standard Defender has a matte or glossy shell, the Defender Suede has a suede-look finish that reads well in the hunter ring, and the Defender Air adds ventilation for hot weather. Swarovski and chrome stripe versions are there for riders who want some shine.

Young riders have the Defender Jr and Defender Jr Suede, sized for smaller heads. For eventers and riders who prefer a cover, One K also makes the Racer skull cap. Tack of the Day carries One K helmets at the lowest prices the brand allows, and every riding helmet we sell is ASTM certified. Stock rotates by size and color, so popular sizes move first.

Fit comes before finish. A helmet should sit level, about an inch above the eyebrows, with even contact all around and no rocking when you shake your head. One K sells replacement refit liners for the Defender and the skull cap. Replace any helmet after a fall, even if it looks undamaged.

Compare more options at the Helmet Center, shop schooling helmets, or browse kids' riding gear.