The pump chamber surrounds the ankle Inflating the pump causes it to conform to the individual contours of your foot, locking in support Durable vented vamping and T-RIB toe cap provide ventilation through the Air Exchange System Pro molded anatomical ankle support eliminates boot breakdown Features full length comfort foam and lightweight molded foam saddled lace bite guard combined with foam felt tongue to maximize comfort and forward flex PLAYDRY black CLAIRNO repels water and delivers comfort Liner features ULTRA FRESH technology (anti-microbial) PRO ARMOUR delivers lightweight protection Skatelock mounted on a lightweight minimized harnesses agility MICROTEX trims maximize abrasion resistance and durability THRUSTER footbed features a "sticky" top cloth and moisture management perforations Lightweight low profile overmolded Texalium outsole maximizes energy transfer and delivers a reactive feel CHASSIS TRI-DI Extruded WT-3 Aluminum provides increased strength and performance Single axle system Wheels: Rink Rat MB816 Bearings: 688 Micro ABEC-7