The Sea to Summit Circuit -9°C Down Sleeping Bag is built for serious winter and cold-weather adventures where dependable warmth matters. Featuring 650+ fill power Ultra-Dry duck down and a semi-tapered rectangular shape, it balances thermal efficiency with added comfort for side sleepers. Lightweight recycled fabrics and a wrap-around zip make it a versatile choice for cold backcountry trips.

Features

• Designed for cold-weather camping, trekking and winter backpacking

• 650+ fill power Ultra-Dry duck down insulation for reliable warmth in damp conditions

• Semi-tapered rectangular shape offers more space than traditional mummy bags

• Ideal for side sleepers while maintaining efficient heat retention

• Wrap-around zip allows adjustable ventilation or full quilt-style opening

• Hybrid box baffle construction ensures even insulation distribution

• Shaped collar and down-filled draft tubes minimise heat loss in cold environments

• Lightweight 20D recycled shell fabric reduces pack weight

• Soft recycled lining fabric improves next-to-skin comfort

• YKK #5 coil zipper with anti-snag plough for smooth operation

• Includes recycled nylon compression sack and storage cell

• Non-PFAS construction with ISO-tested temperature ratings