Bern Unlimited Watts EPS Matte Finish Snow Helmet with Black Wireless Audio Knit Meets Safety Certification ASTM F 2040, CPSC and EN 1214 Thin Shell EPS foam technology protects the user from sharp and blunt force trauma Fit system at back of the head customizes to the shape of the head, keeping it stable and comfortable Compatible Bike/Skate/Warm Weather liner available (sold separately) Outdoor Tech Bluetooth Wireless Audio Kit