Premium Combed Cotton & Hand-Stitch: This Thermal Sock Is Made of Premium Combed Cotton and A-Grade Spandex. Combined with Ergonomic Design and Heat-Trapped Terry, These Heated Socks For Men and Women Are Comfortable, Breathable and Durable.Upgraded: Up to 16 Hours of Heat: Lil Diho Rechargeable Heated Socks Are Equipped with Two 4800Mah Large Capacity Battery, Providing You with Up to 16 Hours Enduring Warmth.3 Heat Settings: These Heated Socks Are Designed with 3 Heat Settings, Including High Heat(155-160, 8.5-9 Hours), Medium Heat(140-150, 12-12.5 Hours), and Low Heat(115-120, 15-16 Hours) Make These Electric Heated Socks Ideal For Keeping Your Feet Warm In Winter. Combined with Two 4800Mah Large Capacity Battery These Heated Socks Are Great For Hunting, Fishing, Camping, Hiking, and Working Outside.Upgraded Heating Element: These Heated Socks Are Equipped with Premium Alloy Heating Wire Instead of The Traditional Carbon Fiber Wire, with A Smaller Diameter(Only 0.1Cm, 1/3 of The Carbon Fiber Wire), Heating UniFor m, Temperature Stability Characteristics.Worry-Free For Long Use: Lil Diho Heated Socks Are Made with Premium Quality Materials. If Youre Not Completely Satisfied, Via Amazon Message, As We offer You A 30-Day Full Refund and We Will Work Hard to Ensure That You Are 100% Satisfied.