evo.com | Sea to Summit Sleeping Pads > With a trimmed down profile and ultralight 40D nylon fabric, the Sea to Summit UltraLight Insulated Sleeping Pad is seriously light. It weighs in just over a pound, but still provides plenty of insulation for an R-value of 3.1. That kind of weight-to-warmth ratio makes it a favorite of long distance hikers who need the most bang for their buck in the weight department. Integrated Airstream Pumpsack The Airstream(TM) Pumpsack is Sea to Summit's big volume mattress pump. The clever design opens at one end to stow the air mat and the other end unfolds to become the built-in pump. The Airstream(TM) Pumpsack can be inflated with a single breath and takes just two or three cycles to fill the mat. Not only is it faster than inflation by mouth, but there is minimal breath condensation entering the mat and it eliminates dizziness from blowing the mat up directly by mouth. Regular 72" x 21.5" x 2" 40D Nylon Face Fabric Thermolite HL-1 HL-1 high loft insulation is a fiberfill constructed with a unique 3D crimp of hollow-core and solid fibers, which provides excellent lightweight warmth with superior durability. The Thermolite insulation lofts up inside the Air Sprung Cells(TM) to prevent convective heat loss from your warm body to the cold ground. Small 66" x 21.5" x 2" | Sea to Summit UltraLight Insulated Sleeping Pad 2022 - Large in Orange | Nylon