Part of the MILWAUKEE WORKSKIN Collection, our Warm Weather Hard Had Liner is BUILT TO FIGHT SWEAT. Our WORKSKIN Warm Weather Hard Hat Liner provides a unique solution to DRY FAST and STAY COOL while working. This performance fabric is engineered to be breathable and wick moisture away from the body. Built for next-to-skin comfort, the 4-way stretch, lightweight design is constructed with flatlock seams. Optimized for use with Milwaukee hard hats and helmets.