Not only is this lovely and cool with the 3D cartoon design, but also the bike can protects kids head perfectly. This is very sturdy with high density plastic shell, besides, the provides great shock-absorbing performance and comfortable cushion. The has buckle straps for under chin which holds it in place. One size fits all head girth of 54-58cm. It’s a great protecive gear for kids when they are cycling, skating, riding, etc. Feature - Color: Blue - Material: Plastic - Size: x 16cm - Size S: 50-54cm (Suitable head girth) - Size : 54-58cm (Suitable head girth) - High density plastic shell ensures durable use and great impact-resistant performance. - Inner pads provide great shock-absorbing performance and comfortable cushion. - Air ventilation holes design keeps kids cool, breathable and sweat-absorbent, great . - Quick release buckle straps, which fasten under chin and holds it in place. - Adjust size with elastic strap, one size fits all head girth of 54-58cm. - for skateboarding, cycling, riding and more sports. Package list: 1 Bike