K2 Sports Men's Mach 90 X-Training 2012 Inline Skates (Black/Green/Red) K2 Softboot , the original, delivers unmatched comfort with the best fit on the market The V02 Aluminum frame is for fast and powerful skating. This lightweight design creates maximum power transfer while remaining stable at speed. Designed to feature all of the functional properties of K2's Stability Cuff with the addition of a stiff rear insert creating more support that is needed to get the most out of the bigger wheels in K2's X-Training series 90mm/83a, ILQ-9 bearings for the smoothest roll avaiable. Everyone knows how traditional lacing works and it's a proven winner. With traditional lacing, you can manipulate the laces to get pressure where you want.