Thermarest Backpacking Pads Prolite Plus Sleeping Pad Cayenne Small 13259. The 1.5-inch (3.8 cm) pad boasts a 3.2 R-value for added warmth in the backcountry. The diagonal-cut foam creates a lighter mattress without sacrificing warmth. Premium materials and foam provide legendary Therm-a-Rest comfort and support. The versatile self-inflating pad features the 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 pads the ProLite Plus is made in market to ensure quality and minimize environmental impact. The pad includes a compact stuff sack.