This Alpinestars Ride Tech Summer Top Long Sleeve Go-Kart T-Shirt has been designed for driving in hot weather and to prevent heat and sweat build-up. It is made of polypropylene fabric with hydrophobic properties allowing better breathability to keep the body cool and dry. This fabric is also hypoallergenic, anti-static and heat resistant. Its aggressive design and close fit help reduce muscle fatigue for better rider comfort.