The Adrenaline Race Shoes by Simpson meets SFI and includes SFI tag. It offers single speedfit closure, low cut Achilles support, fleece Nomex lining, triple layer anterior toe area and non-slip PU sole with Posi-grip traction. These driving shoes feature heat deflecting aluminized Kevlar footbed insert with softknit fire-resistant interior and complete footbed anatomical support. Super-padded tongue and ankle collar for comfort and support. Dual lacing system (speed or standard) provides precision fit for narrow or wide feet. Simpson racing shoes have an adjustable ankle strap for a custom fit. Velour suede exterior for a soft, comfortable fit. Reinforced, perforated-suede side and heel panels protects in high abrasion areas. The perforation allows the leather layers to breathe. Impact's aggressive sole design gives positive pedal control and feel with grooved channels that allow hot air to pass under the sole. SFI-5 Certified. Single Speedfit closure. Low cut Achilles support. Fleece Nomex lining. Triple layer anterior toe area. Non-slip PU sole with posi-grip traction. Learn more about SFI and TPP Ratings by reading our tech article. What are SFI and TPP Ratings?