Whether you're wakeboarding, kayaking, or kite surfing, the Ace Wake water helmet is loaded with features combining style, comfort, and adjust ability. Best known for its 15 open vent holes for optimum ventilation and drainage, removable ear guards, and our Headlock fit system High Density Injection Molded ABS Shell Dual Density Waterproof EVA Liner 15 Open Vents for Ventilation and Drainage 3 Shell Sizes for 6 Different helmet sizes Full Surround Interior Protection CE EN 1385 Water Sport Safety Standard Certification Soft Nylon Webbed Straps Multi-use Rear Mount Strap on Red, Orange, Blue helmets only. (Goggles, Head Light, Camera etc.) Helmet Sizing To ensure that your helmet fits perfectly, we recommend measuring the circumference of your head using a measuring tape. For accurate measurements, wrap the measuring tape just above your eyebrows and around your head. Compare your cm measurement to the chart below to find your ideal helmet size. Size Head Circumference (inches) Head Circumference (centimetres) XS 20.5 - 21.3" 52 - 54cm S 21.3 - 22" 54 - 56cm M 22 - 22.8" 56 - 58cm L 22.8 - 23.6" 58 - 60cm XL 23.6 - 24.4" 60 - 62cm XXL 24.4 - 25.2" 62 - 64cm
