New lightweight quarter construction with additional stiffness, 100% heat mobility, and improved comfort. Alkali Pro Roller Last - Allows for the foot to fit properly with more room in the forefoot. Hyper Lock L pads secure ankles and eliminates heel lift. Nylon outsole with low profile wheel channels. Tac-Lite internal liner. Two piece fully ventilated 7mm felt tongue. Movement one piece stamped chassis - provides quicker turning radius, better balance, and increased power transfer. Alkali Lite 82a wheels. ABEC 7 608 bearings.