Try the Calor Jacket with Heatwave technology and you'll be glad some of us were science club nerds. Its unique ceramic lining is actually activated by your own body heat, to keep you toasty even when you have to sit still in a stand or a blind. Oh, did we mention the Calor Jacket is also wind and water resistant, and features antimicrobial technology to keep your scent under control, too? Wed tell you more, but we don't want to blow your mind.