Additional insert keep one in the wrap and the other in the freezer ready for continuous icing. The insert features Ice Mat pillows (purified water with food-grade freezing agents) in a specially formulated non-toxic gel encased in a polypropylene bag. The outer layer is a nylon velvet loop material and the inner layer is made with Ultra wick fabric which wicks moisture and has Protective protection to control bacterial growth on the wrap.Features For use after arthroscopic knee surgery temporary pain relief for minor sports injuries sprains/strains. Durable. Reusable. Machine washable. Removable inserts. Protective protection Latex-free elastic straps with hook tabs. 2 hours of therapeutic ice treatment. Soft Knee with 2 insert. Dimension - 14 L x 14 H in. Item Weight - 5 lbs. - SKU: PRKLD014