Proudly made and manufactured by Sacksy Thyme, right here in the USA. Our Hot Therapy Heating Pad is double sided, made with fleece on one side and cotton on the other for more comfort and moist heat. Moist heat penetrates deeper into muscles than dry heat which, is experienced with the traditional electric heating pad. No Essential Oils or Herbs are used in this product. If you would like the benefit of aromatherapy, we recommend applying a tiny spritz of your favorite essential oil prior to microwaving. This product typically retains heat for 20-30 minutes after heating for two minutes of microwave. DO NOT MICROWAVE for more than TWO minutes. Discontinue use if irritation occurs. For external use only. Adult supervision is advised when using on children. STORAGE: Keep in Freezer to maintain freshness. Aches and pains have become part of everyday life, as well as stress caused by work, school, and various chores, which we constantly treat with medication. Heat has a relaxing effect and can become an excellent alternative to relieve pain. Heat therapy provides a sensation of warmth and comfort, in addition to providing pain relief and drug-free healing for various types of pain. Heat pads for pain relief provide quick and cost-effective heat therapy by simply placing it where you need it. Injured muscles will need adequate blood flow to heal properly and quickly. The heat provided by the heating pad helps to dilate the blood vessels, and helps speed up healing. SacksyThyme is the perfect hot pack for pain with a sack-like design that helps relieve muscle pain. Unlike a conventional heating pad that is made of bulky, stiff material that can be annoying to wear, SacksyThyme features a soft, pliable material that fits nicely around your body and comforts your shape. It's the only microwavable heating pad that helps with pains in the back, neck, shoulder, legs, arms, hands, feet, face, head, and other body parts. It is microwave safe, washable, and reusable.