Aircast Cryo/Cuff System-Medium Knee & Cooler Aircast Cryo/Cuff sytem features simultaneous cold and compression to minimize swelling and pain * The simplicity to use makes it ideal for ER post-op training room and home use * Insulated jug holds up to 4 liters of ice and water - enough for 8 hours of therapy * 18 -23 Knee circumference 6 above patella