All of the below products are filled with VERY clean, dried cherrystones (cherry pits) which hold heat or cold better than even rocks. The small, kernels of cherry wood easily conform to the shape of the body and allow heat or cold to penetrate deeply in a soothing natural way. They, also, have a nice cherry aroma when heated. These come in several different designs all of which are useful for both heating and cooling. The moist heat the sacs emit is extremely therapeutic for many conditions including: fiber mialga, arthritis, bursitis, rheumatism, congestion, sinus pressure, headaches and variety of aches and pains, including stiff or sore muscles or joints. Childhood growing pains are reduced from the wonderful natural heat. The immediate heat is also great preventative maintenance, preventing tightness due to cold or pain. The cold packs provide a deep penetrating soothing cold that is effective for pulled muscles and pinched nerves, injuries and strains etc. Simply leave the whole sac in the freezer for an hour or more and the wrap it around the neck or knee (etc) whenever cold therapy is needed. It's popular for gardeners for this use. Naturally the larger designs will hold heat or cold longer that the smaller ones but all of these designs will work longer if insulated under a coat or blankets… Aromatherapy is a useful addition to these products by adding a few drops of essential oil directly onto the sac. The moist heat will release the essential oil fragrance and increase the healing pleasure and effectiveness of the experience. Extra Large Soothing Sac $29.95 Soothing Sac (Muffler size) $22.95 Large Soothing Sac $24.95 Sooth the Child $24.95 Sooth the GIrl Child $24.95 VELCRO Soothing Sac Large $29.95