Schiller America Spirometer Mouthpiece, 1 Box of 10 Calf Sleeve Good2Go Large 12 x 16 Color:Yellow Good2Go Large 12 x 16 * Plush multi ply cover design focuses moist heat right where you need it most * Joint specific or multi use shapes for a snug secure fit * Portability convenience and economy in a reusable unit that will last for years * Patented non allergenic fill does not leak smell decay or encourage fungus growth * Fill has a special porous surface to trap the maximum amount of atmospheric moisture * Wide elastic strap holds heat snugly in place while you continue regular activities * Mitt is filled with two soft gel packs that can be heated or frozen as needed to surround your hand with either hot or cold therapy 13 16 inch stoma opening For use with: SP 150 or SP 250 Spirometer