New hats, no sweat!

Looks like Major League Baseball is taking good old George Costanza's advice that wool "doesn't breathe" and switching its wool caps to new summer weather-friendly headgear.

New Era has designed a 100% polyester hat that MLB players will crown starting opening day.

The hat's fabric will "wick" away sweat and reduce the shrinkage that comes with wool, a New Era representative said.

Reducing shrinkage, eh? Something else George Costanza would love about these hats...