Sea to Summit Reactor Extreme Thermolite Mummy Sleeping Bag Liner Hydration the Astro 250 features a

the Astro 250 features a compact body that is more ergonomic

so we developed a large J-zip access panel on the front of the pack with multiple

we’ve used our lightest down proof 10D shell and 7D lining fabrics and upgraded the insulation to our 850+ Loft Premium Goose ULTRA-DRY Down™

Forever ends the debate about whether you can afford the extra weight of a pack cover - the medium size weighs less than 4 ounces and packs into a tiny stuff sack

The Torsion Deck design reduces stress on your joints while creating a natural stride even through steep

Sea to Summit Reactor Extreme Thermolite Mummy Sleeping Bag Liner Hydration the Astro 250 features aIdeal as part of a cold climate sleep system or standalone bag in warm weather. FEATURES Adds up to 15C 25F warmth to a sleeping bag Super insulative 110g m2 THERMOLITE throughout for extra warmth Mummy shape with a box foot Draw cord hood with mini cord lock Extends life of sleeping bags by keeping them clean Contrasting colour along the top edge makes it easier to find the opening Packs into its own Ultra Sil stuff sack Easy care, machine washable