Pearl Izumi Men's Therma Phase Top Fall/Winter 2013 The Therma Phase Top is the ideal midweight thermal pullover. It can be worn next to skin, with a thin base layer or as an insulating mid layer when cooler weather rolls around. Gear designed and constructed to fit perfectly to the body in motion. The perfect balance of anatomic fit, performance engineered materials and the personal interface between athlete and gear. Our 4 core fabric technologies (Transfer, Barrier, Thermal and Softshell ) create a system that works to help you maintain the perfect temperature for the weather conditions and activity range day in and day out Pearl Izumi product is built to last the lifetime of the garment, and this is how long we will stand behind it. Product purchased from an authorized dealer or retailer is fully warranted to the original owner against defects in materials and workmanship