Local Full Flex SIZES S, M, L S, M, L TOTAL VENTS 10 VENTS 10 VENTS COMPLIANCE CPSC BICYCLE ASTM F1492-08 (SKATE) CPSC BICYCLE ASTM F1492-08 (SKATE) CONSTRUCTION ABS HARD PLASTIC SHELL WITH EPS LINER DURABLE & RESILIENT EPP MATERIAL: FOR ACTION SPORTS. IT IS DESIGNED TO COMPRESS WHEN IT TAKES A HIT, AND REBOUND AFTER THE IMPACT. DOUBLE-WALLED CONSTRUCTION: CERTIFIED FOR MULTIPLE ACTIVITIES. EXTENDED SHELL FIT SYSTEM ACTION FIT - DESIGNED FOR STREET AND SKATE HELMETS, THIS STREAMLINED FIT SYSTEM OFFERS AN ADJUSTABLE, SECURE FIT WITH THE TURN OF A DIAL FORMFIT - A HELMET LINER MADE WITH MULTIPLE SEGMENTS ATTACHED TO AN INTERNAL SKELETON, CREATING A FLEXIBLE FIT THAT CONFORMS TO YOUR HEAD RETENTION SYSTEM D-RING BUCKLE WEIGHT 453 GRAMS 741 GRAMS (SIZE M)