Smith Helmets Size Chart Adult HFS 51-55 cm Small 55-59 cm Medium 59-63 cm Large Junior HFS 48-53 cm Youth Small 53-58 cm Youth Medium The Smith Variant Brim Ski and Snowboard helmet displays Smith helmet technology at its finest. Using Smith Hybrid Helmet construction, the Smith Variant Brim is a full-performance helmet. Smiths Hybrid shell construction fuses two separate shells (an ABS and an in-mold) to create a lightweight, low-profile fit. The AirEvac 2 ventilation system helps circulate air and expel excess warmth to reduce goggle fogging. The Smith Adjustable Boa system lets you adjust the fit with an easy-to-use twist dial. Features: Hybrid Shell Construction: fuses two separate shells (an ABS and an in-mold) to create a lightweight, low-profile fit AirEvac 2 Ventilation system helps circulate air and expel excess warmth to reduce goggle fogging Adjustable Boa Fit System lets you adjust the size of the helmet with precision Low-Profile Regulator Adjustable Climate Control 22 Vents X-Static Performance Lining Snapfit Earpads Removable goggle lock Compatible with Smith Skullcandy Audio Systems Item code: H12-VBB, H12-VBM View our full line of Smith helmets here. Get the ultimate in compatibility, Smith goggles with a Smith helmet. Check out our line of Smith goggles here.