The Impact Racing Vapor SC20 Helmets use a large amount of the technology developed in the Impact Racing Air Draft OS20. The off-centered, left-positioned fresh air inlet offers maximum overhead clearance while providing the ultimate in cooling comfort with Impact's exclusive integrated "whisper" channels. Fresh air is circulated through three air ports directed onto the visor, minimizing fog and contaminates while one air port is directed onto the head and channeled towards the neck providing cooling comfort all race long. Superior ambient noise attenuation is achieved through the use of Impact's proprietary insulation foam creating a quieter race environment and reducing the potential for noise fatigue. The Impact Racing Vapor SC20 Helmets also feature a tapered lower design allowing for additional clearance between the helmet and the frontal head restraint device, thus minimizing interference between these two safety systems. Impact Racing Vapor SC20 Helmets utilize Impact's exclusive "Intelligent Gray Matter" inner liner and upholstered with fire-retardant soft-knit Nomex material for superior comfort and fire protection. The Impact Racing Vapor SC20 Helmets offer a truly customized fit with a interchangeable, variable-density cheek pads. A wide-angle, wrap-around eye port, a Kevlar chin strap with dual D-ring closure, and a 1/8" polycarbonate shield with exceptional visual acuity finish off the Impact Racing Vapor SC Helmets.