Kool Coat is the best sheet I have ever had. My bay mare wears one all summer and I can walk outside in 40 Celsius weather and put my hand under her blanket and she will be cool as can be. I love this blanket. Kool Coat Lite Standard Neck Sheet
I really like this Unity fly sheet from horze. Its definitely one of the best sheets I've ever had, the stitching is really good quality. My ponies haven't been able to rip through them so far, so I'm really impressed. They also keep them really cool, and are perfect after a long work out in the sun.