Sparco QRT-Carbon Bucket SeatThe QRT R is the first seat to feature Sparcos patented QRT ultra light technology. This QRT Technology gives an unparalleled mechanical strength weight ratio for fiberglass composite racing seats. QRT Technology gives an average weight savings of 7lbs (up to 10lbs +) per shell. The main benefit is that QRT R seat approaches the weight of a carbon fiber seat at a price of a fiberglass seat. The QRT R is the lightest "Medium Large" size fiberglass