Disposable non-woven Blue covers (cold packs and/or reusable hot/cold packs sold separately). designed to assist in the prevention of Cross contamination when using reusable packs are used by more than on patient. By preventing direct contact between a cold Pack and skin, these sleeves can also help prevent "cold burns" without interfering with the healing process. Great for school nurses and sports teams! highly comfortable with sealed seams. Designed for one-time use. Fits 6" x 9" reusable hot cold packs and cold packs. 24 per case.