ADHESIVE: Simply place these body warmers on your underarms, shoulders, stomach, lower back, or chest to stay warm or help relieve pain and soreness. Do not apply adhesive directly to the skin. OPEN AND GO: Simply open package and shake. Reaches max temperature in 15-30 minutes. No batteries, no charging, works anywhere. If the temperature begins to decrease, expose warmer to air and shake. OUTDOOR: Perfect for skiing, snowboarding, hunting, construction work, outdoor sports, and winter commuting. Stays warm from morning to evening. SAFE & NATURAL: Made with iron powder, water, vermiculite, activated charcoal, salt, and high water absorption resin. TSA-approved for flights. Odorless, non-toxic, eco-friendly disposal. WARMER SIZE: 3.7" x 2.7" x 0.1"; BOX SIZE: 9.75"L x 6.5"W x 7.3"H.