The Simpson Off-Road D3 Restraint buckle does what no other buckle system can. It provides the ease and convenience of a sewn in harness without the shoulder straps being sewn to the lap belt. Its unique patented design eliminates the two shoulder strap links while still allowing the shoulder straps to be joined at the center of the buckle, truly embracing the " V" shape of a 5 point latch and link. Off-Road D3 harness are not SFI Rated for Racing.