For lightweight self-inflating support, the ProLite Apex Sleeping Mat from Therma-A-Rest brings packable performance. The self-inflating 5cm foam features their StrataCore construction, a design that provides the best warmth-to-weight ratio of any self-inflating foam construction. The ProLite Apex 3.8 R-value allows adventurers to stave off the cold during three-season pursuits, along with a high-performance WingLock valve, which has three-times the airflow rate of the classic valve thanks to a larger opening and one-way inflation. Like all Therm-a-Rest mats, the ProLite Apex is made in market to ensure quality and minimize environmental impact and includes a compact stuff sack to pack away the mat into when no longer needed. Prolite Apex Sleeping Mat - Regular