The Heated Longmen Pants are very versatile, and are designed to wear under other garments. The wonderful wicking ability of these pants make it a great layering piece and a must for any long-term exposure to cold harsh weather. The garment also uses antimicrobial fabric which fights odor and bacteria to keep the garment fresh. Features Stretch Antibacterial Fabric Mesh side inserts Three heating panels lined with steel alloy fiber elements, two on thighs and one on lower back Includes (1) 7.4V 2.2Ah Rechargeable Lithium-ion Battery Includes (1) Single Portable Battery Charger Battery provides up to 10 hours of heat Full Power Setting 135°F = ca. 57°C, lasts up to 2.5 hours 75% Power Setting 120°F = ca. 49°C, lasts up to 3 hours 50% Power Setting 105°F = ca. 41°C, lasts up to 5 hours 25% Power Setting 90°F = ca. 32°C, lasts up to 10 hours