Competition-Ready: SFI 3.2A/1 Rated Lightweight & Breathable: Single Layer FR Cotton Shoulder Mobility: 360-Degree Gussets Versatile Purchase: Available as Suit or Separate Jacket & Pants Size Range: 7XS to 4XL Introducing the K1 Challenger Racing Suit Jacket, a single-layer SFI-1 race jacket crafted with premium, treated FR Cotton, perfect for beginner racers, pit crew members, race officials, and mechanics. If your racing league doesn't mandate Nomex fabric, our Proban cotton jacket is the sensible choice. This jacket offers excellent fire protection and adheres to strict SFI 3.2A/1 certification standards, making it an ideal fire suit for various racing classes like dirt track and oval racing, as well as sports car racing. We're confident you'll be satisfied with our K1 SFI.1 jacket.