Microwavable, reusable suitable for both cold and hot therapy, ice treatment: when used as an ice pack reduces muscle spasms, pain, swelling and or bruising after any type of trauma, fever, dental procedure . It is best used in the first 48 hours when applied upon the affected area to reduce swelling around the injury. Ice treatment may also be used for conditions before activity. hot treatment: the pack is excellent for sore, stiff, nagging muscles, joint pain, injuries with no inflammation. It can help to reduce muscle spasms, alleviate pain, elevate blood flow and boost . Avoid the use of heat treatment if the injury shows signs of swelling application of heat can promote unwanted blood flow to the injured area.