The K2 VO2 90 BOA SPEED men's inline skates are intended for everyday training with speed enjoyment on large wheels. Designed with the Vortech Ventilation System, this inline skate uses an intricate pattern of vents, channels and exhaust to minimize moisture in the skate and liner, keeping the overall weight of the skates supremely light. A Boa® Closure System takes K2’s Original Softboot® to a new level of comfort. The Vo2 Cuff provides maximum support while transferring power to the 90mm/80A wheels and ILQ-9 Classic Plus Bearings.. We recommend that you measure your foot length in cm, the foot should be tight in the skate. Thanks to the patented K2 Softboot® technology, the inner boot can be fine tuned to fit you perfectly while you skate and it can gain up to 1/2 a size in the heel within the first few rides. Do not order the skates according to the regular size of your shoes, the sizing can be slightly different for every manufacturer.