The Sea to Summit Thermolite Reactor Compact Plus Liner increases sleeping bag performance by up to 20F (11C) with dual-weight Thermolite fabric.Sea to Summit's regular 80 g/m2 is combined with panels of 110g/m2 Thermolite in the core body and foot bed areas adding extra warmth where most needed.The compact, shorter design shaves off excess weight while giving maximum warmth for torso and feet.Features: Lighter weight, more packable than fleece Adds up to 20 degrees F of warmth to a sleeping bag Mummy shape with a box foot Draw cord hood with mini cord lock Packs into its own 3 x 5" sil nylon stuff sack Specs: Size variation: One size Length: 72" Width: 36" Weight: 9.3 oz Temp Rating: Up to 20 F Color: Black/Orange