The K2 VO2 S 90 BOA is a skate combining the popular VO2 cuff chimney for excellent stability with the innovative VO2-S single-sided frame. They are a great choice for ambitious fitness skaters who are used to going fast, appreciate a smooth ride and high performance. 90mm wheels ensure easy manoeuvrability and effective power transfer which you will find out during long intense rides. Vortech feet ventilation improve your comfort.