The K1 Precision auto racing suit is a Nomex SFI-rated fire suit that is perfect for auto racing venues. Features: The K1 Precision auto racing suit is made of double layer DuPont Nomex III and is SFI 3.2A/5 rated. Quilted from the outside with a soft collar, wrist cuffs, ankle cuffs, belt and epaulette, and featuring a custom ribbed back-stretched panel for added comfort and ribbed elastic under the arms to facilitate 360 degree movement, the K1 light weight auto racing suit is a comfortable, useable fire suit that is specially designed for auto racing applications. The K1 light weight auto racing suit combines the safety of a Nomex fire suit with the comfort and value of a K1 Race Gear racing suit into one unbeatable package. K1 - Precision Suit Sizing Chart