3D INJECTED BOOT - New ergonomic boot-shaping system provides great comfort and durability STIFFNESS PERFORMANCE INDEX - 115 - Solid core for good skating performance. BRUSHED MICROFIBER LINER - Comfortable and high resistance to wear. FELT TONGUE - 7mm felt with added foam for comfort and protection. CCM FOOTBED - Provides support and comfort. DUAL FASTFRAME ALUMINIUM CHASSIS - Durable chassis designed to be lightweight for fastest skating position. BEARINGS - RIZON ABEC 5 CCM WHEELS POWERED BY KONIXX - 82A durometer wheels that are perfect for all surfaces. Senior Size: 4x80mm Junior Size: 4x76mm Youth Size: 3x68mm