The lightweight, self-inflating ProLite Apex compresses small and has Therm-a-Rest's legendary support. The self-inflating foam is 5 cm high and has a StrataCore construction with the good warmth-to-weight ratio of all self-inflating foam mats. Thanks to an R-value of 3.8, adventurers can brave any cold with the ProLite Apex in three seasons.The small-compression, self-inflating mat has a high-quality WingLock valve that allows the mat to inflate three times faster thanks to the larger opening and inflation in only one direction. Like all Therm-a-Rest mats, the Trail Pro is made domestically for quality and environmental protection. It comes with a compact stuff sack. StrataCore construction - a continuous layer of thermal foam sandwiched between alternating air and foam ribs - Designed for three seasons without adding much weight. Sturdy, self-inflating foam. Fits in virtually any backpack. Suitable for any Fast & Light adventure. WingLock valve - intuitive and reliable valve provides maximum airflow. Comes with a stuff sack. Category: Thermal air mattress. Function: includes pack & carry bag. Coating outside: Polyurethane. Outer material: 100 % polyester. Mat thickness: standard. Weight: 850 g. Packing size (cm): 28 x 17 cm. Length (cm): 196 cm. Width (cm): 64 cm. Thickness: 50 mm. Type: thermal air mattress. Type: standard construction. Self-inflating performance. R-value: 3.8.