Span Nomad Jr Sidetrack II Sidetrack II Mips Lil Ripper SIZES XS, S UY UC, UY, UT UY T, UC TOTAL VENTS 10 VENTS 15 VENTS 14 VENTS 14 VENTS 10 VENTS MIPS MIPS (MULTI-DIRECTIONAL IMPACT PROTECTION SYSTEM) - A LEADING SLIP PLANE TECHNOLOGY DESIGNED TO REDUCE ROTATIONAL FORCES THAT CAN RESULT FROM CERTAIN IMPACTS INTEGRATED MIPS (MULTI-DIRECTIONAL IMPACT PROTECTION SYSTEM) - MIPS IS DESIGNED TO REDUCE ROTATIONAL FORCES THAT CAN RESULT FROM CERTAIN IMPACTS CONSTRUCTION ABS HARD PLASTIC SHELL WITH EPS LINER FUSION IN-MOLD POLYCARBONATE SHELL - A PROCESS PIONEERED BY BELL BONDS THE HELMET'S OUTER SHELL TO THE EPS FOAM LINER TO CREATE A STURDIER HELMET. FUSION IN-MOLD POLYCARBONATE SHELL - A PROCESS PIONEERED BY BELL BONDS THE HELMET'S OUTER SHELL TO THE EPS FOAM LINER TO CREATE A STURDIER HELMET. FUSION IN-MOLD POLYCARBONATE SHELL - A PROCESS PIONEERED BY BELL BONDS THE HELMET'S OUTER SHELL TO THE EPS FOAM LINER TO CREATE A STURDIER HELMET. FUSION IN-MOLD POLYCARBONATE SHELL - A PROCESS PIONEERED BY BELL BONDS THE HELMET'S OUTER SHELL TO THE EPS FOAM LINER TO CREATE A STURDIER HELMET. VISOR REMOVABLE VISOR 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 ERGO FIT - SLEEK, EASY-TO-USE DIAL SYSTEM FOR ONE-HANDED ADJUSTMENTS ERGO FIT - SLEEK, EASY-TO-USE DIAL SYSTEM FOR ONE-HANDED ADJUSTMENTS (INTEGRATED WITH MIPS LAYER) ERGO FIT - SLEEK, EASY-TO-USE DIAL SYSTEM FOR ONE-HANDED ADJUSTMENTS (INTEGRATED WITH MIPS LAYER) ACTION FIT - DESIGNED FOR STREET AND SKATE HELMETS, THIS STREAMLINED FIT SYSTEM OFFERS AN ADJUSTABLE, SECURE FIT WITH THE TURN OF A DIAL RETENTION SYSTEM NO-TWIST TRI-GLIDES: QUICK-ADJUST FASTENERS THAT HELP KEEP STRAPS FLAT AND PROPERLY POSITIONED NO-TWIST TRI-GLIDES: QUICK-ADJUST FASTENERS THAT HELP KEEP STRAPS FLAT AND PROPERLY POSITIONED NO-TWIST TRI-GLIDES: QUICK-ADJUST FASTENERS THAT HELP KEEP STRAPS FLAT AND PROPERLY POSITIONED SMARTLOCK NO-PINCH SIDE BUCKLE WEIGHT 423 GRAMS (SIZE S) 353 GRAMS 320 grams (size Y) - 310 grams (size CH) - 270 grams (size T) 360 grams (size Y) - 350 grams (size CH) 221 GRAMS (SIZE T)