1、This ABS resin helmet is impact resistance, anti‑corrosion and wear resistance. So it brings you ear protection and suspension adjustment. 2、This water helmet could be used for multi sports, such as water sports, cycling and climbing. It has high practical performance. 3、The helmet's inner shell is bonded with high‑foam EVA. It is also lighter and more comfortable to wear. 4、This outdoor helmet can rotate clockwise to lock and counterclockwise to relax. It can adapt to various head circumferences. 5、This water helmet has a total of 11 vent holes. It can effectively dissipate heat and ventilate during your long‑term wear. 6、This ABS resin helmet has refined appearance and will let you fondle admiringly. Its matte black outlook is filled with features of the times. Item Type: Water Helmet Material: ABS Standard: SGS Testing Standard Purpose: Water Sports/Emergency Assistance Inner Circumference: Approx. 58-64cm/22.8-25.2inInner Width: Approx. 20-22cm/7.9in-8.7in 1 x Helmet 1 x Storage Bag