Supplied with 2 reusable Ultimate Performance Cold/Hot packs, the Cold/Hot Wrap has a mesh pocket that allows you to treat muscular injuries during activities. Insert the pack in the mesh pocket and use the 2 velcro straps to keep in place through exercise, or just through the day. The packs remain at temperature for at least 1 hour and are easily cooled by at least 10 minutes in the freezer, or heated for 10 minutes in hot water/30 seconds in the microwave. The pack gel remains pliable and flexible even when cold for comfortable and easy application.