The QRT-R was the first seat to feature Sparco’s patented QRT ultra-light technology. The QRT-R is the lightest “large” size fiberglass seat on the market. It is lighter than some of the competitors “medium” size seats. The QRT-R was specifically designed for a large driver and it fits a 36” waist driver comfortably. The QRT-R is unique because it was designed to fit a larger driver but has excellent fitment into smaller cockpits. The QRT-R is FIA approved.