The 2-in-1 Magnetic Rechargeable Hand Warmers by outjut are perfect for winter sports enthusiasts. These pocket-sized hand warmers are made of silicone and have a black color. With a battery capacity of 5000 milliamp hours, they can provide warmth for up to 8 hours on a single charge. The charging time is just 3.5 hours, making them convenient for use during outdoor activities like skiing or snowboarding. These portable hand warmers are designed for unisex-adults and come with a manufacturer warranty of 1 year. Keep your hands warm and cozy while enjoying winter sports with these high-quality hand warmers.