*Runs small, order a size up Try the Calor Jacket with Heatwave(TM) technology and you&';ll barely notice the cold around you. Its unique ceramic lining is activated by your own body heat, to keep you toasty even when you have to sit still in a stand or a blind. It&';s also wind- and water-resistant, protecting you from elements that amplifiy the cold, and features antimicrobial technology to keep your scent under control.