K2 Skate Men's Fatty Pro Inline Skates Original K2 Softboot The development process for K2's Aggressive cuffs involves huge gaps, slides and plenty of topside and boot tricks; This cuff as good as it gets K2's aggressive frame features hex frame spacers that make it easy to customize configuration from rockered to flat in no time; UFS compatible Wheels/Bearings: 55mm, 80a/ABEC 16 For a custom fit, traditional lacing allows you to manipulate the laces and tension to hold the heel, mid-foot, or any spot you want a snug fit