The adaptable, efficient and warm Ascent Ac3 from Sea to Summit is the down sleeping bag that will keep you comfortable on most of your expeditions.

The Ac3 has a -11°C comfort rating and -18° lower limit so its suited for use in colder conditions. This bag features a tapered rectangular shape making it roomier than a mummy bag, while still providing thermal efficiency. You can easily adjust the Ascent according to the weather thanks to the free-flow triple zips. The half zip on the right side means you can fold it down to free up your arms, the full-length zip and separate foot zip allows you to use it as a quilt when it’s hot, and you can close it all up on a cooler night.

Insulation is provided by the R.D.S certified 750+ loft down, while the vertical baffles over the chest help prevent cold spots forming. For maximum insulation, there’s a side block baffle to keep the 60/40 fill ratio and the oversized draft tubes trap your body heat. The shell and lining of this bag are made from lightweight nylon to keep the weight down, while the large internal security pocket allows you to keep valuables safe and sound as you snooze.

Be prepared for changing weather conditions on your adventures, with the adaptable Ascent Ac3 Sleeping Bag from Sea to Summit.

• -11°C comfort rating and -18° lower limit
• Tapered rectangular shape balances space and warmth
• Versatile down bag which can be adapted to weather conditions
• Half zip on right side provides movement for both arms
• Full length two-way left side zip and separate foot zip allows for us as a quilt
• R.D.S certified 750+ loft duck down for insulation
• Oversized draft tubes prevent body heat escaping
• Vertical baffles on the chest to prevent cold spots
• Side block baffle to maintain a 60/40 ratio
• Generous hood and dual cord adjustment
• Large internal security pocket for valuables
• Compatible LH and RH bags zip together