SIZE FROM KIDS TO ADULTS: Size for 4-14 years old;. Size can be adjustable (Please check the size chart in the detail picture). MULTIPLE USAGE SCENARIOS: For kids sports safety protection especially for ice and roller cycling skating, Skateboard Hover board, biking, cycling, skating, rolling, ATV, BMX and other extreme sports. SPECIAL DESIGN: 2 Ways for wearing, Strappy dressing and Sleeve dressing. Adjustable elasticity, more convenient to wear. SHOCK-PROTECTION AND COMFORTABLE: Made of durable PP and breathable fabric, adjustable elastic straps for secure. The thickening design will be good protection during sport, Lightweight, ventilated EVA foam provides cool air flow and limits perspiration, providing you full protection. POPULAR PRESENTS FOR KIDS: Great holiday gifts for your boys and girls, and teenagers. It's really sure that kids will be very pleasantly surprised when receiving this presents on birthday, International Children's Day, Thanksgiving Day, Christmas and other festivals, even as a reward.