Impact Racing 78110809 Underwear - ION Pant SFI FIA XXXL BLK. The ION line of Nomex® base layers provide the highest level of breathability, comfort and protection. The ION uses a seamless construction with ultra-soft stretchable material. The ION line is manufactured of varying woven materials in specific areas to provide a more comfortable driving experience. A thin stretch Nomex® for the upmost range of motion, without bunching up, and a double perforated Nomex® for increased breathability. The minimal seams are stitched flat with thin specialized thread for added comfort. The ION line is FIA 8856-2000 homologated, and SFI 3.3/5 approved. Available in black or white in two sizes M/L, XL/XXL.