Rollerblade Skate Helmet. Certified protection (CPSC) for rollerblading, biking or other non-motorized sports. This helmet has a modern, lightweight design to be minimilastic, without sacrificing protection. In-mold technology makes it light and breathable.Turn-dial adjustment makes things easy for when you forget to cut your hair or share. 18 strategically placed vents to keep you cool. Certifiications: CPSC 18 Stregically Placed Vents In-Mold Technology for Lightweight Construction (292 grams) EPS Liner to Dissipate Force and Absorb Impact Turn-Dial Size Adjustment Buckle with Chin Pad ; Strap ; Y-Straps Reflective Labels for Added Safety Single Impact Helmet - Replace After: Powerful Blow Deep Abrasion Fall of 5 Feet + After 5 Years Sizing: MD 21.25 - 22.8" ; 54-58cm LG 22.80 -24.40" ; 58-62cm