Alpinestars Usa 4704018-10-XXL

F1 specification underwear, constructed using an innovative flame resistant technology developed by Alpinestars. Lenzing FR is a special natural viscose fiber with unique thermal insulation and permanent flame resistance properties that help prevent heat stress and heat stroke. Lightweight, special material structure offers high breathability performance. Relaxed fit offers increased comfort. Extended collar for greater performance. Special material formulation is more breathable and has better elastic properties than conventional fabrics.