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To make a rice sock, you'll need a 100% cotton sock without any metal or synthetic materials in it so it doesn't burn in the microwave. Open the sock and fill it ¾ of the way with uncooked rice. Then, tie the empty part of the sock into a knot to secure it, or tie a piece of string around the end of the sock. Microwave the sock on high for 1-2 minutes. Keep an eye on it while it heats in case it starts smoking. Let the sock cool for 10-20 seconds, then take it out of the microwave and apply it to your sore muscles for relief. Reheat the rice sock after it cools if you’d like. If you want to learn how to freeze the rice to make a cold pack, keep reading the article!