The Anon Oslo WaveCel Helmet pairs 3D cellular protection with an in-mold construction featuring a lightweight shell with an EPS and WaveCel liner designed in a sleek, low-profile style, specifically designed for round head shapes. WaveCel technology distributes impact energy to help reduce direct and rotational impact forces to the head. A 360° BOA® Fit System provides quick, on-the-fly fit adjustment with the turn of a dial, and the Fidlock® magnetic helmet strap buckle allows for easy one-hand operation, even with gloves. Two integrated vents keep air circulating for fog-free goggles and all-day comfort. The plush fleece liner and ear pads provide warmth and moisture-wicking for maximum comfort.Anon Oslo WaveCel Helmet Features: 448g; WaveCel helmets are designed to fit closer to the head, providing a snug, comfortable fit. Please refer to our sizing chart for accurate measurements. If you are in between sizes, you may want to size up. Low Profile Fit WaveCel® behaves like a network of hundreds of interconnected shock absorbers connecting your head and the outer shell of the helmet. WaveCel® helps distribute the impact energy through its network of cells, reduces impact forces like the crumple zone of a car, and then helps divert rotational forces by flexing and gliding. In-mold shell construction fuses a lightweight polycarbonate shell with an EPS liner for a low-profile fit Passive ventilation channels, highlighting WaveCel material through two vents, help draw fresh air in the front and pull moisture out the back. Snow stopper fabric retains warmth and comfort for cold-weather conditions while preventing snow from entering the vents. In-Shell 360° BOA® Fit System integrates a fit dial directly into the helmet and provides for micro adjustments in a complete halo around the wearer's head Fidlock® snap helmet buckle uses magnets to allow you to open and close the buckle with one hand even when wearing gloves Thermoformed ear pads enhance fit and comfort while improving sound awareness of what's going on around you; Compatible with audio accessories.