This item is a super lightweight ski helmet specially designed to offer your kid perfect protection when outdoor cycling, skateboarding, roller skating, ice skating, riding scooter, etc. Flexible buffering material with higher performance and better absorption. A must-have-thing for winter ourdoor activities. Features - Material: polyester, EPS and ABS. - Size M: 52-58cm(Head circumference). - Size L: 56-61cm(Head circumference). - The helmet uses integrally formed outer shell and high-density EPS inner with thickened sponge, high performance and absorption. - 12 vents on the helmet for easy dissipation of heat and moisture, help air ventilation and sweat absorption, keep your head dry. - and breathable fluffy earmuffs, easy to detach and clean, prevent coldness and keep warm when playing outdoors. - Adjustable rotation helmet dial make it suitable for different head circumference and comfortable to wear. - Unisex design, suitable for both men and women. Great for many occasions, such as skating, skiing, snowboarding, etc.