Priorities: Lightweight & packable comfort, warmth, widest range of size/shape options Good for use in extreme cold With the highest warmth rating in the Ultra sleeping mat series, Ultra 7R is a cozy, lightweight, and compact sleeping mat. Features include recycled 20 D ripstop face fabric, certified carbon neutral by myclimate. It is perfect for human powered adventures including backpacking, thru-hiking, bike packing and alpinism. EXPED's DOWNMAT TECHNOLOGY™, with 700 cu. in. down insulation, allows for use in all seasons or simply to keep cold-sleepers warm any time. Meanwhile, a 9 cm thick air cushion cradles the body for ultimate comfort. Air chambers run head to toe, fully supporting the body for an unrivaled night's sleep and giving maximum durability. Note for Ultra 7R mummy shape: Outer chambers do not contain insulation.