Troxel(r) rebel helmet Troxel rebel 04-275S incorporates western fashion on a sporty helmet ideal for adventurous riders in and out of the arena. The rebel line introduces the next level of western helmets with three edgy graphics: rocker, cross and Star. Built for bold performance and comfort, the rebel arms adventurous western riders with high-end features and durability. Astm f1163-04a/sei certified & CE certified to European EN 1384 standards click on important helmet warning to the right features: sure fit Pro fit system mesh-covered vents low profile matte duratec finish moisture-wicking flip-fold fit adjustment removable, washable headliner air-channel technology ASTM/sei-certified item specifications: sizes: s (up to 7), m (7 - 71/4), L (71/4+).