PHD Mountain Software

Ideal for long expeditions in extremely cold conditions. The sophisticated baffle system is designed for excellent down control, while the short zip and gusset combination makes it completely fail-safe. It is cut wide, with an inner measurement of 164cm around at the chest (enough to accommodate even down clothing inside) expanding to 182cm with the gusset open. A full-length zip version is also available for maximum ventilation.

"Research and recommendations has indicated that your clothing and sleeping systems are probably the best available"
Ian Couch - Endure Team

900 down option

This option extends the range of this bag to -33C. Weight stays the same. Read more on our exceptional 900 down.

Picture shows Xero 1000. Xero 800 is lighter. Detail pictures of gusset show Xero 600, Xero 800 is thicker.

• Cowl hood: close fitting with drawcord; inside lined with Drishell.
• Side V Channels: down filled channels along each side ensure insulation; extra outer/inner differential allows full loft
• Wind and water resistant Drishell outer plus inner panels at head and foot
• Extra width for expedition use
• Short zip with down-filled gusset for security (in the event of zip failure) and for extra expansion if needed
• Collar - 3D collar in Drishell with drawcord
• Footpiece - ovoid shape to fit naturally to feet and avoid pressure
• Black inner for quick drying
• Large mesh storage sac
• Stuff sac
• Pack size: 25 x 44cm†
• Set Options:
• 900 down (same insulation: 130gm lighter)
• Full-length zip: double end: left or right
• Taped waterproof outer in HS2 fabric.‡ Find out more about this fabric.

In addition to the standard options you can customize this bag further. Find out how.

†Please note: we make our stuff sacs big enough to allow fairly easy stuffing rather than reducing the bag to the tightest minimum. What air is left in the packed item will easily be compressed out of it, if you are squashing it into a small space in your rucksack. Tiny stuff sacs look impressive: but unless you are a sac-wrestling fan, fighting the gear into them day after day can be an unnecessary chore.

‡Please note: the optional HS2 outer is a complete extra outer shell, with seams taped for weatherproofness. The extra layer of fabric adds considerably to the weight and bulk of the basic bag (around 180gm - 6oz). It increases the weatherproof qualities of the bag in mountain or arctic situations, but it is not a substitute for a proper bivvy bag when sleeping out in the rain.