Amazon is selling 39.99 The Merkapa adult bicycle helmet is CE and CPSC certified, and the entire helmet is only 17g ultra light! Each helmet is equipped with a storage backpack with bright lights for safer night riding. The helmet, made of integral molding technology and high-density EPS structure, helps absorb impact energy and provides a large coverage area on the back and sides of the helmet, protecting your head from bumps and bruises. The helmet has 14 large breathable vents and maintains airflow through the bicycle helmet. The size is 28 * 21cm, which is 50 in a box