When comfort is a priority but a small pack size is also important then the new NeoAir Topo brings three-inches or 7.6cm of support in a pack friendly size. The rectangular-shaped pad is built with Therm-A-Rest’s legendary WaveCore™ construction, creating a stable pad that provides long lasting warmth and comfort. The 2.3 R-value rating is great for three-season camping or backpacking when you’re enjoying adventures in remote valleys or beside mountain lochans. The Therm-A-Rest Neoair Topo 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 and this large version gives you more length and width to enjoy.Therm-A-Rest Neoair Topo (Large) Features: 50D Mini Hex Rip Polyester New WingLock™ Valve Technology WaveCore™ Construction Lightweight and Durable Dimensions 64cm x 196cm Packed Dimensions 28cm x 15cm Thickness 7.6cm R-Value 2.3 Weight Approx 850g