Booby Tubes are natural, safe, gel-free breast packs made with a100% organic cotton shell and filled with all-natural flax seed. Use warm or cold, depending on your nursing needs. Store them in the freezer and wear them inside your bra between feedings to help reduce the swelling and tenderness of engorgement and to comfort breasts during weaning. When heated, they safely deliver warm, moist heat to tender breasts to encourage milk flow, maintain open milk ducts to prevent clogged ducts, promote let-down and comfort the symptoms of infection. Mama's unique gel-free construction was designed with extra care to help reduce the risk of burns. Simply warm Booby Tubes in your microwave for 20-40 seconds OR preheat your oven to the lowest setting and place them in an oven-safe dish for 10-15 minutes.