Sea to Summit Circuit Down Sleeping Bag

Adapt to any adventure. The Circuit’s semi-tapered-rectangular shape fits you and fits your travelling, camping and backpacking lifestyle. Its extra width allows you to sleep on your side, wrapped in 650+fillpower down and soft-touch fabrics. As the weather warms, the wraparound zipper lets you ventilate the bag from top to bottom, and even open it as a fully flat quilt. Sea to Summit design and quality, non-PFAS recycled materials and ISO-tested performance make this light, packable bag the perfect travel companion.

FEATURES

• 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 - Comfort-oriented, brushed liner maximise movement and maintain warmth all night
• Precise ventilation - Wrap‑around zip lets you fully open the footbox for maximum venting and fine-tune airflow to regulate temperature
• Lightweight breathability - Featherlight 20D polyester balances airflow for moisture management with proven durability for long-term use
• 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 are designed to go the distance

TECH SPECS