The Classic 2.0 Low Rider is Sandbox signature brim helmet. Features a vented low profile soft-core EVA liner. Water sport fit pads in all Low Rider helmets feature a polyester spandex fabric that is specially formulated to be both durable and quick drying. Water sport ear cover compatible (ear covers sold separately). Includes: Helmet with two sets of water sport sizing fit pads and user manual. Certification: CE EN 1385:2012 /  Helmet for canoeing and white water sports. FEATURES CE CERTIFIEDCertification: CE EN 1385:2012 / Helmet for canoeing and white water sports. SOFT CORE Flexible EVA (ethylene vinyl acetate) foam designed to protect against multiple low force impacts. LOW PROFILE All Sandbox helmets are designed to have an ultra low profile fit without compromising safety. CUSTOM FIT All our helmets come with multiple fit pad thicknesses so you have 18 different ways to make your helmet fit perfectly. UNDERCOVER VENTING Our Classic 2.0 models have stealth vents which allow air to flow into channels in the liner where heat and moisture is pushed through and exhausted out the rear vents. QUICK DRY The fit pads in all our Low Rider helmets feature a polyester spandex fabric that is specially formulated to be both durable and quick drying. EAR COVERS Our Low Rider models feature removable water sport ear covers to provide protection for your ears when you need it (sold separately). Size Small Medium Large Hat Size 6 1/2 - 6 3/4 6 7/8 - 7 1/8 7 1/4 - 7 1/2 Inches 20.5" - 21.3" 21.7" - 22.4" 22.8" - 23.6" Centimeters 52cm - 54cm 55cm - 57cm 58cm - 60cm