You can freeze these Ladies Hot Feet Therapeutic Slippers to ease sprains, bruising and swelling or microwave for heat. Made from super soft and plush fleece, these slippers are filled with temperature-sensitive linseeds. Heat the slippers in the microwave to relax your aching feet, or slip them on after they"ve been in the freezer to help reduce swelling. The linseeds retain their temperature for long-lasting comfort. Microwave in 20 second intervals until desired warmth is achieved. Then slip the hot feet over your feet and relax. Feel the softness of these slippers surround your feet and caress your toes in cozy warmth. OR, place in a clean, sealed plastic bag and let it stay in the freezer for a few hours. Indulge yourself after a long hard day. Savor the plush coolness as it gently drapes over your feet. Hot or cold - these hot feet therapeutic slippers will pamper and coddle your feet. Ladies Small / Medium Size 6-8.