[Adjustable Elastic Strap] You can adjust the adhesive elastic band according to your needs, and it fits most waist sizes. It is also a good gift for your family and friends. [Wide Benefits] It can help with insomnia and other sleep problems, digestion, absorption and bowel movements, joint pain and more. It gives your body a good rest and relaxation. [High Quality] The product has 2-layer design, and the inner layer is made of high-quality bamboo flannelette, soft and comfortable to use. It can improve the absorption rate and can be used repeatedly, easy to clean. [Relax Your Neck and Waist] This castor oil aid pack set includes 1 essential oil aid pack, 1 neck aid pack for waist and neck respectively. It can promote blood circulation and let the body get a good relaxation. The outer layer of the pack can prevent oil leakage and keep you away from oil stains. [Easy to Carry] The product comes with a zip-top bag for storing hot/cold packs to speed up oil absorption or cooling as needed. It hugs your body as you move around without getting in the way of your work.