Photo via Under Armour
You've pulled out all the stops for your outdoor workout—warm socks, comfortable sweats, multiple layers on your torso. You've thought of everything . . . until your unprotected ears throb as if you forgot to chew a piece of gum while the airplane takes off. You need something on your head, and Under Armour's Infrared Stealth Beanie is just right for the job. It's light and breathable to keep you from overheating, but at the same time it retains heat with a thermo-conductive inner coating to save you from a literal brain freeze.
$27 at underarmour.com
Photo Credit: Getty Images // Thinkstock