A significant improvement over ice bags or gels bulk packs in sleeves, the Thera-Med Back Pad Reusable Cold Pack uses advanced proprietary materials and patented gels to stay flexible even at freezing temperatures. Thera-Med is the only cold pack specially designed with two sides for direct contact with the body (without annoying sleeves or insulators,) to provide you with penetrating maximum strength cold therapy. Here's how it works: After storing in the freezer, place the Blue Soft Side on the injured area for 5 to 10 minutes. Next, flip the pad over, placing the White Side on the body for 20 minutes for penetrating cold therapy. Repeat every two hours until the pain or swelling is relieved. Dimensions: 12 x 12 with rounded corners. Blue on one side, White on reverse. Product dimensions (imperial): 12 inch L x 12 inch W Product dimensions (metric): 304.80 mm L x 304.80 mm W TMF10140 Dual-Temp technology Flexible gel therapy Versatile size and shape Reusable and portable