PCI Race Radios Driving Shoe The PCI Racing Driving Shoes are fully SFI 3.3/5 rated and meet the rigorous standards set by most racing series. Features: Upper is made of 100 split sweet leather Lined with knitted Nomex fabric, laminated with foam padding Rubber sole with laser engraved logo Laces are made of fire-resistant Nomex thread Insole is also made of knitted Nomex fabric laminated with sheet rubber