Sea to Summit Circuit Down Sleeping Bag -1C

• Comfort in all conditions Opens flat for airflow on warm nights or zips closed to lock in warmth when temperatures drop
• Efficient packability Quality 650+ fillpower Ultra‑Dry Duck Down and lightweight fabrics allow the Circuit to pack down small into the supplied compression sack
• Room to move Soft touch liner and wider, thermally-efficient shape enhance warmth and comfort, no matter which position you sleep in
• Precise ventilation Wrap‑around zip lets you fully open the footbox for maximum venting and fine-tune airflow to regulate temperature
• Lightweight breathability Premium 20D fabric offers perfect next-to-skin comfort night after night after night
• Consistent insulation Hybrid box‑baffle construction prevents down migration, eliminating cold spots for even warmth
• Easy zipping YKK #5 coil zipper with anti‑snag plough ensures smooth, jam‑free operation in all conditions for hassle‑free use
• Draft protection Shaped collar and continuous down-filled draft tubes minimise heat loss and maximise retained warmth
• Verified warmth ISO 23537 certification confirms dependable insulation performance for rated temperatures
Internal pocket Zippered pocket stores essentials like your phone or head torch securely while keeping them insulated from the cold
• Lower impact materials Constructed from bluesign APPROVED, 100% recycled fabrics designed to go the distance

Certification
bluesign APPROVED, ISO 13537-1, RCS - 1114661, RDS - 883003

Material
Shell: 100% Recycled Polyester; Lining: 100% Recycled Polyester; Insulation: FP650 Grey Duck Down 80/20 DWR RDS; Compression Sack: 100% Recycled Nylon; Storage Cell: 100% Recycled Nylon

Packed dimensions
Short: 15.5 x 22.5 x 41cm
Regular: 15.5 x 22.5 x 41cm
Long: 15.5 x 22.5 x 41cm

Weight
Short: 770g
Regular: 820g
Long: 910g

Baffle design
Short: top is box-baffle, bottom is sew-through
Regular: top is box-baffle, bottom is sew-through
Long: top is box-baffle, bottom is sew-through

Comfort temp rating (°C)
Short: 2°C
Regular: 2°C
Long: 2°C

Extreme temp rating (°C)
Short: -20°C
Regular: -20°C
Long: -20°C

Fill weight (g)
Short: 384g
Regular: 411g
Long: 469g

Insulation type
FP650GDD

Internal foot circumference (cm)
Short: 98cm
Regular: 102cm
Long: 106cm

Internal hip circumference (cm)
Short: 140cm
Regular: 140cm
Long: 150cm

Internal shoulder circumference (cm)
Short: 145cm
Regular: 145cm
Long: 155cm

Lower temp rating (°C)
Short: -1°C
Regular: -1°C
Long: -1°C

Recommended user height
Short: 170cm
Regular: 185cm
Long: 198cm

Stuff/compression sack volume
Short: 13L
Regular: 13L
Long: 13L

Zipper configuration
Left Handed Full-Length YKK#5 with Zipper Plow