Inner Wear Turtle Neck Top (X-Large) PY4700500Inner Wear Turtle Neck Top (X Large)White, SFI Approved PY4700500 4700500 Pyrotect's ultra thin Inner Wear is designed for use with any driving suit, and is as soft as cashmere and as absorbent as cotton! Talk about comfort No more scratchy, irritating Nomex next to the skin and the absorbency keeps you cool and dry. It is SFI rated (SFI label attached) for use as underwear, but is also designed so it can be worn under Nomex underwear for added TPP