Relieve achy, sore muscles and joints. This wrap is very versatile. Lay over shoulder, across knees, around neck and many more uses. Heat wraps, as all of our Spa Wraps, have a removable insert filled with an all natural mixture of flax seed infused with herbal flowers or leaves and pure essential oil. Heat in carousel microwave approximately two minutes (depending on the power of the microwave). Freeze for cold therapy. Reg. 24"x7" Lrg. 28"x8"