I really like the fact that I can place it on my ankle, while resting my foot upon a stool, and it doesn't slide off as fast as those with a sleek exterior. So, the rough exterior is a good thing. I just wish it stayed colder longer. I need to use twice as many as another Instant Ice Pack - that I cannot find anymore. So, I'm careful when using these. If I'm going to need to ice something for more than 15 minutes, and I'm home, I'll just go grab a bag of frozen corn! Still useful when 'on-the-go'. As I stated in the "Quality" section, I will probably look online for another brand when I need more.
Does keep really cold for about 15 minutes.