Flex Rating and Fit Flex Rating: 4 (1 softest-10 stiffest) Mid-range flex rating allows for a comfortable way to take on all kinds of boarding Construction Low-Pro Outsole provides you with great grip 3D Formed tongue Liner and Lacing IntuitionTM Comfort Foam 3D thermoforming liner Custom Moldable External J Bars give you supreme heel hold. CondaTM Liner Lacing System for refined comfort K2 Speedlace Lacing System for fast and easy tightening Special Features EVA Insole decreases vibration