Small in size, big on pain relief! The THERA°PEARL Oval Packs use Pearl Technology which consists of tiny pearls that are pliable when frozen or can be heated in the microwave. This allows for the Oval Packs to conform around the body and stay hot/cold for the doctor recommended 20 minutes of pain relief therapy. These hot/cold packs are reusable, which is great for the wallet as well as drip-free, non-toxic, and easy to clean. Life can be full of surprises and no one can predict when those bumps, bruises, or insect bites are going to happen. The Oval Pack is an inexpensive way to relieve pain, so keep one in the freezer and one beside the microwave.