The Shield RW-9 line of Nomex undergarments provides the highest level of breathability, comfort and protection. When designing this line, Sparco studied the driver’s sitting position to ensure ultimate fit and comfort. Shield RW-9 uses a seamless construction with ultra-soft stretchable material. Three are two different woven materials in key areas; thin stretch Nomex for comfort and mobility as well as a double perforated Nomex for increased breathability and ultimate comfort. The minimal seams are stitched flat with thin specialized thread for added comfort. All Shield RW-9 pieces are treated with Sparco X-Cool Silver which draws heat from the body surface to cool the driver. In addition to cooling the driver, X-Cool Silver treatment has an anti-bacterial effect.