Material: PU leather rubber sole. Note: The sizes are converted to USA standard according to Amazon size chart. You can choose according to the following suggestions. If your kids have wide and thick feet, we suggest you to choose one size larger one for him/her. SIZE SUGGESTIONS: Please measure heel to toe length and choose size according to followings. 6(inch) foot⇒size: 10 Little Kid/ 6.3(inch) foot⇒size: 11 Little Kid/ 6.8" foot⇒12 Little Kid/ 7.4" foot⇒1 Little Kid/ 8.2" foot⇒2.5 Little Kid / 8.7" foot⇒4 Big Kid/ 9.5" foot⇒6 Big Kid. PLEASE PURCHASE BIGGER SIZE IS BETTER THAN SMALL SIZE IF YOU ARE NOT SURE. When you want to glide Press the button at the heel. The roller will pop up automatically. The roller uses muted bearing, which makes the glide smooth and quiet. If you just want normal sports shoes You can simply press the button at the heel to hide the roller. Hide the roller by pressing down the button and push the roller back at the same time, release the button to lock, and then slide the black window back. In sum, you can pop up and hide roller by a button at heel. High-quality material, breathable, wear-resistant rubber soles which is the best gift for lovers and kids for birthday, performances, Halloween, Thanksgiving and Christmas Day and other celebration. Notice: Shoes can be cleaned by soft fabric, BUT DO NOT WASH AND STEP INTO WATER AND DIRT. SDSPEED is the company from Korea - Home country of BTS -, we try to satisfy the customers' needs and expectations. Please COMPARE and ENJOY our competitive PRICE, QUALITY and CUSTOMER SERVICE. We are proud of our Price Competitiveness is 100% across All Similar Products on market.