The Simpson Helix Racing Suit is part of the DNA range of racing equipment. It is designed with athletic performance features that are engineered to reduce restrictions in driver movement and save weight. They are an SFI.5 Rated, Nomex fabric racing suit with 270 degree arm and back gussets, and knee and inner thigh stretch panels. The Simpson Helix Racing Suits also feature a lower back stress relief panel and upper back ventilation port.