You’ll always be prepared for a good night’s sleep on your backpacking adventures with the cosy and adaptable Altitude At1 from Sea to Summit.

This sleeping bag features a rectangular design to give you extra space so it’s great for restless side sleepers, it’s also wider at the hips and narrower at the shoulders to cater to women. To keep the weight down, the shell and lining are made from light breathable nylon that packs down small while the vertical chest baffles prevent the down from migrating. Filled with extra RDS 750+ ultra-dry down for superior insulation, with oversized draft tubes to trap heat, and THERMOLITE synthetic panels under the feet – the Altitude is designed to keep you warm.

You can keep cosy when it’s chilly and ventilate on a warmer evening thanks to the Free-Flow triple-zip design. The left has a half zip to free up your arms or fold it down, while the full-length two-way side zip and separate foot zip allows you to use it as a quilt. Or if you’re cold, close up the zips and snuggle down in the generous hood. While you’re snoozing, you can also keep essentials like your phone or headtorch handy in the large internal security pocket.

With a great balance of comfort and weight and a versatile design that can be adjusted according to the weather – the Altitude At1 from Sea to Summit will have you sleeping soundly. 

• -4°C comfort rating, -10°C lower limit
• Tapered rectangular women’s specific design with wider hips and narrower shoulders
• Free-Flow triple-zip design for adaptability
• Half zip on the left and full-length two-way side zip and separate foot zip
• Super light nylon shell and lining
• High-quality RDS certified 750+ Loft ULTRA-DRY Duck Down for insulation
• Oversized draft tubes prevent body heat escaping
• Panelled footbox and 3D hood
• Extra down overall and THERMOLITE panels under the foot area
• Vertical baffles over the chest to prevent cold spots
• Large internal security pocket
• Storage cell and a lightweight compression bag for storage
• LH and RH bags zip together