Snowmobile Helmet Motorcycle Helmet Modular Flip up Anti Fog Pink (S) Go to amazon.com Related posts Top modular snowmobile helmet FeatureSM __ 54 - 55 _____ 21" - 21 5/8"MD __ 56- 57_____ 21 3/4"- 22 3/8"Lg __ 58- 59 _____ 23 3/4"- 23 3/8"X-Large __ 60 - 61 _____ 23 1/4" - 24" DescriptionAnti-fog lens .Standard replacement snow shield available part number 304!To reduce fogging the adjustable chin vent directs air upward across the inside of the shield.Large eye-spot for improved range of vision