CoolShirts are available in short sleeve cotton construction for non FIA racing or general use, and long sleeve modacrylic/rayon blend flame-retardant construction approved for race use (SFI 3.3 Certified). Cotton short sleeve shirts in black or white. Modacrylic/rayon blend flame-retardant construction long sleeve shirts in blackThe shirts feature a long length of tubing stitched over the chest and back areas to carry coolant and keep you cool while racing. The shoulder area of the flame-retardant shirts does not feature tubing to allow the use of a Hans/FHR device without obstruction.Cool Shirts will fit to any of the driver cooling systems and connect via dry break quick release connectors.