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