OMP Racing KS-4 driving suits are rugged 4-layer Karting suits that are comfortable and FIA-approved. They feature polyester outer layers with soft cotton sponge interiors.OMP Racing KS-4 driving suits feature:* Elastic knit fabric arm bellows offers maximum freedom of movement* Mesh inserts on legs, shoulders, and pockets for ventilation* Low-cut neck collar* Available in a range of adult and children sizes