1. Single squeeze allows for easy activation of packs offering immediate relief to injured area 2.Non-woven lining helps prevent the pack from sweating and can be placed directly on the skin; 3.Reman hot 15-30 mints and achieves a high temperature of 130 F 4.Flexible material conforms to body contours 5.Ideal for applications such as neck pain, arthritis back injuries and shoulder injuries�?Treat muscle strains, aches, tension and cramps.