" Fit & Design: Skate Liner Plus & Footboard Sizer - Provides a premium fit with a new padding design and anatomical fit Perforated mesh in the forefoot provides breathability while the lycra toe area ensures comfort in the toe box The Comfort Flex tongue with its cushioned wings and reinforced median bar gives improved flex and control Technology: Secure Closure System - Locking cuff buckles, micro-adjustable 45deg buckles and lacing through the shell and liner cuff help get the custom precise fit Extruded Aluminum Frame - Superior 243mm/10""/9.6"", 255mm/10"" (sizes 29.0-31.0), racing axles, laterally adjustable Additional Details: Elite - Performance Hydrogen Wheels - 80mm/85A wheels made in USA with proprietary urethane formula for ultimate performance, less vibration and excellent wear; Twincam ILQ-9 Classic Plus bearings maximize speed