The Roller Derby Alpha Quad Skates are a top of the line skate from Roller Derby. They feature a soft boot that is fully lined suede to ensure you can skate for hours and still feel comfortable. They are fitted with Twister wheels that work both indoor and outdoors. 65mm wheels on the front give you maneuverability and 70mm wheels will give you the speed you desire. The Alpha skates feature air venting to keep your feet cool and the air cushioned footbed will keep your feet soft and comfortable. . Lining Material: Full Suede, Skate Type: Outdoor Roller Skates, Special Features: Air Cushion Footbed, Wheel Configuration: 65mm - 65mm - 70mm - 70mm, Bearing Type: 698 Micro Bearings, Bearing Size: 698 - Micro, Frame Material: Monocoque Chassis, Bearing Grade: Recreational, Wheel Size: 65mm/70mm, Skill Range: Beginner - Advanced Intermediate, Model Year: 2011, Product ID: 253212, Sizing Information: This skate is sized in a Mens cut. Women should purchase one size smaller than their shoe size.