These hand warmers deliver gentle, long-lasting warmth using natural steam heating technology that is activated when exposed to oxygen in the air. They provide warm and cozy relief for hands or feet for hours, anytime, anywhere. - Long-lasting comfort: The natural steam heating technology activates when exposed to air, delivering steady warmth for hours to hands or feet. - Instant heating onset: Heat is released quickly after opening, providing fast comfort. Each warmer maintains heat for about 4 hours, making them suitable for outdoor adventures or cool studio environments. - Portable and easy to use: Lightweight and easy to carry and store. Slip them into gloves for long-lasting warmth, making them especially suitable for outdoor adventures, work trails, or relaxing at home. - Multipurpose heat therapy: Strategically designed to relieve muscle discomfort, focusing heat on the back, waist and other areas that require local heat. A versatile choice for anyone with cold hands and feet. Use scenarios - Outdoor activities in cold weather: hiking, trail work, camping, or winter commutes where keeping hands warm is essential. - Chilly work or studio settings: long shoots, outdoor filming, or cold indoor environments where extra warmth helps maintain dexterity and comfort. - Home use and targeted relief: after activity or long periods of sitting, use for back or waist comfort to soothe tension and improve overall warmth.