YAHILL Multi-Use Safety Protective Gear Child/Teenager/Adult Helmet, or Children/Kids/Adults Knee Elbow Wrist Pads, for Cycling Roller Skating and Other Extreme Sports 1. Multifunctional Protective Gear: Perfect for ice and roller cycling skating and other Extreme Sports. 2. Professional and comfortable: lightweight, ventilated EVA foam provides cool air flow and limits perspiration. 3. Durable material: shock absorbing, safety insurance and stylish design. 4. Child helmet: Suitable for 3-10 years old children, head circumference: 20-22.5inch. Adult ski helmet head circumference: 22-24inch. Dial fit offers 100% adjustability for larger or smaller heads. 5. Children/ Adult Knee Elbow Wrist Pads (3-pack): XS is for 3-7 years old; S is suitable for children of 8-12 years old; M is suitable for adults of 5ft-5.7ft (100-155lb); L/XL is suitable for adults of 155lb-220lb.