K2 Sports Junior Hero Pro 2012 Fitness Inline Skates (Black/Green) Adjustability up to five full sizes means kids won't outgrow a K2 adjustable skate, it's simple to fine-tune the frame to fit different-sized feet, your child can wear these year after year as they grow, and then hand them down! This frame is designed to absorb road vibration and lower the skaters center of gravity for a smooth, controlled ride. Designed to build confidence in new skaters. 72 mm/80a dureometer wheels with ABEC 3 bearings for smooth, comfortable ride Easy-pull lace system with locking buckle and pushbutton adjustment