The Swany Men's Artic Toaster Convertible Mittens have an outer shell that generates heat through the absorption of visible and infrared rays from the sun and reflects the wearers warmth back to the hand. Additionally it is insulated with a layer of Primaloft with Comformax Radiant Shield. Pre-curved construction gives this mitten flexibility and the Aquaguard lock down zipper allows you to move your hand through the opening and use your fingers without them getting cold thanks to the inner glove lining.