This luxury Hot and Cold Compression Pack is reusable. Ideal for sports injuries or long term treatment of ongoing issues. For a great cold compress which relieves muscle aches and pains place the pack in the freezer. For a warm soothing pack place in the microwave for 30 seconds. Great for muscle strains, stiff necks and other aches and pains. A very handy size pack which measures 23 x 13cm x 2cm fits nicely in to drawers and takes up little space.