My wife uses the Polar packs on her back for her Degenerative bone disease. She has to use them multiple times daily and Polar packs hold up very well to the rigorous usage.
I've tried many ice packs but the Flexible Polar Pack is the coldest and stays cold the longest. I love these packs!
long lasting GREAT ice packs for injuries. form fitting to body. Have had 2 packs for 2 years that have withstood frequent use.