Colder and stays cold longer!
I ordered a smaller size on my last purchase and found it to be such good gel packs that I got a second larger one.  They get way colder and hold it longer than 2 other brands I have. I haven't tried heat yet. Very durable exterior and very handy cover with straps that are holding up at different angles and stay on where I put them! Very pleased!
Rating: 5 stars