Available in 3 In Form Sizes: S(52-55.5cm), M(55.5-59cm), L (59-62.5cm) * In-Mold construction, X-Static anti microbial padding * 12 Super Cool vents with Thermostat control plus Stack Vent * Compatible with all after market TuneUps systems * Compliance: ASTM F2040/CE EN1077