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Shimano has used both types
Spherical Technology allows the helmet's outer liner to rotate around the inner liner during a crash
RECOMMENDED FOR: ASTM 5
Reid double wall alloy
SIZING GUIDE
Giro Radix MIPS Trail MTB Bike Helmet - Harbor Blue Brand_Seer Shimano has used both typesRADIX MIPS HELMET THE RADIX MIPS HELMET COMBINES RUGGED STYLE AND DURABILITY TO MEET THE DEMANDS OF CORE TRAIL RIDERS, WITH THE COVERAGE, LIGHT WEIGHT, AND VENTILATION RIDERS NEED TO RIDE COMFORTABLY AND CONFIDENTLY ALL DAY.. DETAILS THE RADIX MIPS HELMET IS FOR THE RUGGED ADVENTURER WHO APPRECIATES A PERFECT FIT, THE SUN STAYING OUT OF THEIR EYES, AND PLENTY OF VENTILATION. The highly adjustable Roc Loc 5. 5 Mips system allows you to customize fit
