Full HEATR® Cold Weather Pant 656HPFBWSI's warmest pants Will keep you warm even in temperatures from 20 to 50 F HEATR is built in the lining of the pants through the thighs while also having thinner spandex in the groin and calf area for ventilation and flexibility Flat inner seams on the calf provide maximum comfort 4 way stretch for flexibility, durability and comfort Machine wash cold, gentle cycle, with like colors Line Dry Made in USA HEATR: 70% Polyester, 27% HEATR, 3% Spandex