This is the most popular and versatile size of Soothing Sac.
These sacs are longer and wider than the muffler size product. They are designed to lie across the shoulders or small of the back. They hold the heat longer than the smaller version.
These 100% Cotton, also, have gross grain straps to hold them tightly in place. They can also be used as foot warmers or hand warmers. Simply heat for 2-3 minutes in the microwave and it will stay warm from 20-120 minutes or longer (depending on the situation) size is about 6" x 23".