The latest KS Winter R kart underwear long sleeve t-shirt has been developed by working closely with the best karting teams around the world. The use of seamless 3D technology fabric provides unmatched comfort and breathability to the driver. With thermal properties, the underwear allows the driver to condition their core temperature maximizing concentration levels and maintaining performance. This version is made in children's specific sizes. Highly breathable to keep you cool and reduce perspiration. Seamless construction to reduce pressure points and improve comfort. Child-specific sizes