Thermarest Hyperion 20 UL LG

But when packed down into its compression stuff sack, it is impressively compact, allowing you to carry it with ease, even in a small rucksack. It’s designed to work with an insulated sleeping mat to keep you warm, with zoned fill that strategically places more of the premium 900 fill-power down on the top and sides of your body, leaving your mat to do its job underneath. It’s also fitted with removable SynergyLink connectors – basically, thin elasticated straps that keep your bag attached to your mat (no more sliding around in the night). But plenty of attention has also been paid to comfort too, with super soft fabrics, an ergonomic shape and a longer zipper to give you a better night’s sleep compared to the highly tapered ‘performance mummy’ fit of most cramped ultralight bags.

• 2-3 season sleeping bag with EN Comfort limit of 0°C/32°F and EN Lower limit of -6°C/20°F
• One of the lightest pieces in its class, the ultralight Hyperion offers exceptional warmth-for-weight
• Employs ultra-premium 900-fill power moisture-resistant Nikwax Hydrophobic Down, tested to stay drier and maintain loft 60 times longer than untreated down
• Responsible Down Standard (RDS) certified fill ensures that the waterfowl in the down supply chain are treated humanely
• Lightweight materials and precise design allow for a tiny pack size in the supplied compression stuff sack
• Box-wall baffled construction in key areas maximises loft and minimises cold spots, while internal mesh side walls save weight
• Ergonomic shape and longer zipper provide a more human-friendly fit than other ultralight bags
• Removable SynergyLink connector straps allow you to attach the bag to your sleeping mat for optimal efficiency and comfort
• Zoned insulation maximises warmth and saves weight by intentionally placing fill where you need it most, 70% on the top and sides with 30% on the back