Share 'Kinda off topic,but how do you guys stay cool in the heat?'

We played the other day and it was in the mid 90's and brutal and this course has very little shade or wooded holes. I seen these stay cool towel or what ever there called,just wanted to know if anyone tried one of these and if they worked? Thye say you just pour water on it and it gets cold? Maybe but how long would this last when the sun is beating down on you? Or if you know of any other ideas…