So I saw this commercial recently advertising this cooling towel (I think it was called enduracool) that was originally designed for pro athletes to use. Basically you get the towel wet and then snap it and it's supposed to stay cool. Some reviews I've seen say it stayed cool for 40 minutes to a couple hours. I immediately though of getting one, cutting it in size and trying it under a binder on a hot day. I haven't done it yet. So far I've only seen them at Lowe's home improvement store for about $14. If I do get around to trying it, I'll mention if it works or not. Sure would make a difference to have a cooling layer though on a hot day!