Solid an inflexible when frozen.  Would not recommend!
Terrible!  Freezes solid when put in the freezer.  Requires a fabric tube or towel between it and your knee or it's literally like fastening ice directly to your skin.  It is not flexible once frozen.  There are other products available that are much better for the same price.  This one isn't worth it.  I ended up buying another that is soft when coming out of the freezer and has a pad so no towel is needed.  It was roughly the same price as this
Rating: 1 stars