FXR Shredded Green and Grey Frostbite Block Balaclava - Large Allows 100% breathability at the top of the head Blocks wind to dramatically reduce frostbite exposure in the critical collar to helmet gap Designed for use with FXR Cold Stop Anti-Fog Mask or any helmet with breath box Ultra lightweight brushed inner polyester-spandex fabrication FXR proprietary 4-way stretch mapped windstop system