<b> <br>SIZE SUGGESTIONS: Please measure heel to toe length and choose size according to followings. 6.3(inch) foot⇒size: 11 Little Kid/ 6.8" foot⇒12 Little Kid/ 7.1" foot⇒13 Little Kid / 7.4" foot⇒1 Little Kid/ 7.8" foot⇒1.5 Little Kid/ 8.2" foot⇒2.5 Little Kid / 8.5" foot⇒3.5 Big Kid/ 8.7" foot⇒4 Big Kid/ 9" foot⇒5 Big Kid/ 9.5" foot⇒6 Big Kid/ 9.75" foot⇒7 Big Kid. PLEASE PURCHASE BIGGER SIZE IS BETTER THAN SMALL SIZE IF YOU ARE NOT SURE. Please pay attention to the following before choosing a size. The '11 Little Kid' size is the SMALLEST, and the Little Kid size is getting larger in the order of 11≪12≪13≪1≪1.5≪2.5. Big Kid size is getting larger in the order of 3.5≪4≪5≪6≪7. The '7 Big Kid' size is the LARGEST size. You can enjoy Various Colors (Total 7 colors, 11 Modes!) LED light and recharge by a integrated switch behind velcro. You can recharge by USB cable, rechargeable interface is behind velcro. You can pop up and hide roller by a button at heel. So you can use this both of roller skates shoes and normal sports shoes. These skates shoes are great- comfortable fit- sleek style too. You walk on the road , the shoes light up automatically. Amazing 11 Modes Light-up LED, sneakers soles light up in Colors! 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 (be evaluated by Amazon) is 100% across our All Listing Products on Amazon.