67% nylon, 23% polypropylene, 10% elastane. Thermal pants. Soft, stretchy fabric with embossed patterns and special reinforcement weave on legs and knees and hips. Waistband and leg bottoms in the same fabric as the shirt. Seamless to avoid the risk of irritation. Peculiar properties: breathable and thermoregulatory body fabric, not detectable by metal detectors. Removable label.