Roller Derby Boy's Trac Star Adjustable Roller Skate Man Made A molded shell with hinged cuff with locking cam-lever buckle closure straps.. Washable comfort liner.. EZ push button adjustable sizing: medium fits shoe sizes 12-2 and large fits shoe sizes 3-6.. 54mm cast polyurethane wheels.. G-force 608zb carbon bearing.. Model number: 1372. Made in China. Supportive boot and comfy padded liner make it easy for kids of any age to get rolling Thick, padded tongue for a great fit Locking Cam-Lever buckles are safe, easy, and quick to use with no laces to tie Push the button to adjust the skate up to 4 shoe sizes! Reinforced polymer frame with non-marking toe brakes (one on each skate) Lightweight chassis with real cushions and trucks for controlled cruising and turning 54mm urethane wheels travel well over indoor and outdoor surfaces Includes G-Force 608ZB carbon bearings for a smooth roll Use these skates at the roller rink, or outside on paved trails, sidewalks, and boardwalks If you are a beginner, skating lessons at the rink or park are a popular way to learn Find a local rink at web.rollerskating.com/search New skaters will often try skating first inside the house, starting on carpet to go slower, then try rolling on hard floors Check wheel and truck tightness and adjust as needed prior to use Make sure wheels are clean before using at the rink You can improve balance, agility, strength and endurance, and have fun while doing it It is a low impact exercise that can be done almost anywhere It&#039;s perfect for individuals or family and friends who want to stay healthy and active Benefits include stamina, muscular strength and endurance, flexibility, balance, weight control, muscle definition, digestion, and sleep Inline skating at a speed of 20MPH can burn 360 calories/hour To help prevent injury, always wear a helmet and protective gear (wrist guards, knee pads, and elbow pads) The size Medium adjusts from size 12J to 2. The size Large adjusts from size 3 to 6. Wider feet, growing feet, or half sizes may wish to go up a size Wear thicker socks Add a shoe insert/insole (sold separately)