Racetech Booster CushionThis EVA foam cushion fits underneath your race seat's base cushion to increase its height. We have two sizes available to get your optimal seating position. These cushions come complete with velcro strips on the underside to secure it to your seat base. Upholstered in black Racetech nylon fabric to match your seat. Designed to get a short driver to sit up a little higher in our seats. Available in either 20 mm (. 78") thick, 30mm (1. 18"), or 40 mm