Therma-Tru's Fiber-Classic®, Smooth-Star® and Slim-Line™ fiberglass sliding patio door systems offer beauty and dependability.  You can be assured that they will withstand all types of severe weather and offer exceptional thermal performance.  Our sliding patio doors come standard with Low-E glass and are Energy Star rated.  Therma-Tru sliding patio door systems come standard with a Multi-Point Locking system and spring loaded foot bolt for added security.