Easy-to-use reusable gel pack provides both hot and cold therapy * Reusable Hot and Cold Packs are used to help relieve sore muscles arthritis and common aches * The Reusable Gel Packs can be frozen or heated for hot /cold therapy and are able to retain their temperature for up to 20 minutes * Reusable Hot and Cold Packs are ideal for rehabilitation facilities and personal pain relief * Delivers soothing relief from sore muscles arthritis sprains swelling common aches and bruising * Retains a therapeutic temperature for approximately 20 minutes * Freeze or microwave * Reusable and non-toxic