The Alpinestars KMX-5 v3 suit was designed and developed to maximize breathability of the suit while also reducing the weight. Exclusive, all-new outer shell material developed made from a blend of polyester and polyamide and combined with soft knit lining for optimum levels of protection, light weight, and comfort. Innovative circular, laser cut perforations on the upper chest and back, with open weave mesh on the torso sides, crotch, and on the armholes, provide maximum airflow for cooling. Anatomical arm, leg, and torso paneling is patterned to create the optimum position while driving. The KMX-5 v3 suit will keep you cool when the temperature goes up, both in and out of the kart. FIA 8877-2022 Grade 1 homologated. Not fire-resistant, therefore only for karting use.