Polyethene (not fiberglass) racing seats are a durable seat made of almost indestructible plastic perfect for racing go karts.
You have the option to customize it by forming it to individual drivers. The seat can be formed using a heat gun to make it slightly larger or smaller. It fits most sprint kart models: Birel, Sodie, Mskarts, Starto's, Swiss Hutless, Tony Kart and many others.
NOTE: The XXL seats are mis-stamped with "L" underneath the base of the seat but are indeed XXL