The Thermarest Trail Pro uses StrataCore construction offering an impressive warmth-to-weight ratio for the self-inflating foam.  The StrataCore uses a continuous layer of thermal foam nestled between alternating ridges of air and foam allowing the cushion to easily compress into a smaller size.  The Premium Self-Inflating Comfort has 3 inches (7.6cm) of premium foam wrapped in ultra-plush stretch-knit fabric.  The Trail Pro has an intuitive, reliable WingLock valve maximizes airflow for easier inflation and faster deflation.  The wings flip up for one-way inflation to save breath. With an R-value of 4.4, your sure to stay warm.  Storage Bag Included!