PROFOX-103 Black Large Auto Racing Fire Resistant Single Layer SFI 3.2A/1 Suit Pants (pants only) Soft and comfortable 1 layer Auto Racing Pants. Premium fire resistant filament with box quilt stitch design and Nomex thread construction. Increased driver protection for all types of racing. Double stitched epaulettes for added strength in the event an emergency extraction is required. Expandable rear waistband. Straight Leg Bootcut. Looks like a standard leg with the Nomex cuff hidden inside. Genuine SFI 3.2A/1 Certification crest.