Spark -1C/30F Beluga Black

Spark -1C/30F, by Sea To Summit, is a sleeping bag with an optimal warmth-to-weight ratio and an 850+ fill power that make this bag as comfortable a choice as it is compact and easy to store.

The mummy cut maximizes thermal efficiency and offers better heat retention with a lightweight design for warmth, compactness and outdoor comfort.

• RDS-certified 850+ goose down, treated with Ultra Dry Down for improved water resistance in wet conditions.
• Shell and lining in 10-denier Nylon. Hood and footbox in waterproof and breathable 10-denier Nylon.
• Mummy cut: fitted cut with generous footbox and technical hood, to maximize thermal efficiency and minimize volume and weight.
• Main zipper - 1/2 length #5 with draft tube and two sliders. 
• Box-wall baffles on the upper half of the bag and sewn-through quilted construction on the lower half. 
• Fitted technical hood with soft-touch adjustment. Extra deep for a comfortable feel.
• A single down-filled draft tube along the top of all zippers.