Impact Racing 49000710 Drag Over-Boots XXL. Our Impact Top Fuel/Top Alcohol Over-Boot, which fits securely over Impact race shoes, is made with our high-quality Nomex® inner and outer and is designed with a full heel to calf zipper and overlock hook and loop extra-length cover. Manufacturer’s certified to the SFI 3.3/20 specification. Sizes: Small (5-7)/Med (7-9)/Large (9-11.5)/ XL (11.5-13)/XXL (13-14) Colors: Black only