FeaturesMIPS Safety SystemMips in ski helmet is short for Multi-direction Impact Protection System. The inbuilt MIPS low friction layer allows a multidirectional movement of 10-15 mm on certain angled impacts, intended to reduce rotational force to the head and ensure maximum safety.Built-in Ventilation Channel11 airflow channels of the MIPS snow helmet - including four channels that can be adjusted by a toggle switch easily, even when wearing gloves. The ventilation system allows the extra warm air and moisture to flow easily, making your skiing & snowboarding experience more comfortable than ever.Super LightweightReinforced PC Shell + shock-absorbing EPS foam formed in this ski helmet with MIPS technology by the in-mold technique for a lightweight one-piece design.Adjustable FitElastic strap that fixes your goggles securely to your helmet. The leather clasp allows you to adjust the fixture singlehandedly, even with gloves on.Audio Compatible EarpadsThe removable earmuffs are compatible with the OutdoorMaster headphone and most of the audio devices on the market. Removable earmuffs & inner fleece liner are super easy to clean as well!Seamless CompatibilityThese best MIPS helmets are designed to match the curvature of the goggles frame. The seamless joint between the helmet and the ski goggles allows them to achieve the best performance.Ventilation for GogglesThe ventilation channel built in the helmet's front section is compatible with most goggles on the market. The outlets of the channel align with your goggles, keeping them clean and fogless by letting the heated air out through the channel within the internal EPS and fleece lining.Size ChartS: 20.07-21.25 inches (51 - 54cm) M: 21.65-22.83 inches (55 - 58cm) L: 23.22-24.01 inches (59 - 61cm)Official Supplier of the U.S. Ski & Snowboard TeamAlthough the brand is young, we have become an official supplier to the U.S. Ski Team with our innovation and reliable quality. By sponsoring USCSA (US Collegiate Ski & Snowboard Association), we also support young people to inspire their potential.Choice of Professional AthletesMany professional athletes have been impressed with the quality and technology of Outdoor Master products and have chosen to become ambassadors for our brand. We also constantly improve and upgrade our products through feedback from our athletes in training and competition.