Lightweight, self-inflating and supportive, the ProLite Apex is easy to slip into your bag and benefits from legendary Therm-a-Rest support. The self-inflating foam is 5 cm (2 in) thick and uses our StrataCore technology, a design that offers the best warmth-to-weight ratio of any self-inflating foam structure. The Prolite Apex's R-value of 3.8 keeps you warm when you go on a three-season adventure. The compressible self-inflating mattress features our high-performance WingLock valve which allows the mattress to inflate three times faster thanks to a larger opening and one-way inflation. Like all Therm-a-Rest mattresses, the Trail Pro is manufactured locally to ensure quality and minimize environmental impact. The mattress comes with a compact storage bag.