The all new Leatt GPX 5.5 FlexLock boot, a 3-year project with long term development and testing using Pro athletes from all over the world!The GPX 5.5 boot is a real head-turner when it comes to look and style, but the design brief was comfort and protection also.As you slide your foot inside the boot, you instantly feel the plush interior and quality of the materials used.The adjustable FlexLock system reduces forces to the ankle by up to 37% and the knee by up to 35% by locking out the ankle movement when over flexed, giving you that feeling of security.With great feel of the frame, gear lever and rear brake, these boots instantly feel so good.You must check out the SlideLock Velcro function, it really is ground-breaking in security fastening boot technology. FlexLock SystemAdjustable boot flexLockOut of the ankle movement Force ReductionLockOut ankle movement gives: Up to 37% reduction of ankle forcesUp to 35% reduction of forces to the knee *Reductions compared to the market leader/most high-end boots FitOutstanding first-class fit even for wide feet Ankles3D-shaped impact foam over anklesHeel grip ankle design Toe-BoxLow-profile, gear shift friendly shape SoleDualZone hardnessExtended foot peg riding zone for arch and on the blade riding styleSteel shank reinforced and CE certified CuffSlideLock systemAuto-locking, one-way sliding closure Bike GripFlat and grippy bike side of the boots for great bike feel BucklesForged AluminumOver-locking function Inner LinerBreathable mesh 3D liner with anti-slip reinforcement for zero heel lift CE tested and certified asprEN 13634: 2017 Size US 7-13, UK 6-12, EU 40.5-48, CM 25,5 -31