Fast-Acting: Dynarex Cold Hot Medicated Patches Relieve Painful Aches And Pains Almost Immediately. Simply Place A Self-Adhering Patch To The Skin And The Cooling Sensation Begins On Contact To Dull Pain. The Warming Sensation Allows Muscles To Relax Up To 8 Hours Of Relief: Soothe Sore, Aching Muscles, Painful Bruises, Arthritis Pain, Backaches, Strains, And Sprains Quickly With Powerful Cold Hot Medicated Patches For Up To 8 Hours. Change The Mess-Free Patch Up To Three Times Per Day Topical Analgesic: The Cold Hot Medicated Patches Are A Topical Analgesic That Delivers Pain Relief Without Using Gels Or Creams. The Soothing Comfort Allows You To Either Rest Comfortably Or Continue To Move Pain-Free Throughout Your Day Natural Menthol: The Icy Warming Sensation Of These Pain Relief Patches Is Due To The Use Of Natural Menthol In The Cold Hot Medicated Patch. Use Them For Minor Injuries As Well As To Alleviate The Discomfort Of Chronic Conditions Choose The Right Size Patch: Soft And Flexible, These Patches Are Available In Two Sizes And Designed To Fit The Contours Of The Body. The Larger Patch Is Commonly Used On The Back And Larger Areas While The Smaller One Is Perfect For The Arms Or Neck