The Under Armour ColdGear Infrared Ridge Reaper PrimaLoft Pant is the ideal choice for hunters who require a little extra insulation but don't want the weight that it is normally associated with it. 100 grams of PrimaLoft insulation will help you stay warm and weights practically nothing. The STORM DWR water repellent finish will help keep you dry in damp weather, while the ColdGear Infrared Technology will increase heat retention. ColdGear Infrared technology is a result of Under Armour using infrared imaging to research and pinpoint heat loss in insulation systems, in an effort to make their gear warmer. Stealth Bombers stay undetected by utilizing a high-tech ceramic coating that absorbs electromagnetic waves, keeping heat in, rather than dispersing it into the atmosphere. Mimicking this technology, Under Armour was able to create a flexible ceramic coating on the inside of the garment that holds heat better rather than dispersing it, keeping you warmer and in the field longer.