Sonic Down Mummy Sleeping Bag brand-The Mountain Air The IPX4 ingress protection rating

The IPX4 ingress protection rating means this is engineered to keep up in the field

The FREINO is ideal for adding or adjusting friction during the descent

giving you the perfect hang

Charge multiple devices at once

Sonic Down Mummy Sleeping Bag brand-The Mountain Air The IPX4 ingress protection ratingBuilt to be the only bag you need from 0F to 40F, weve updated our Backpacker Editors Choice award winning big mountain bag, Sonic, for even greater warmth, tuneability, and reduced environmental impact. With this bag, we are launching our next generation Thermo Gills with a new multi stage zipper system that dramatically increases the usable temperature range of the bag and allows fine tuning of comfort from within the bag. Sonics new chevron baffle