Sea to Summit Spark -1C Down Sleeping Bag Long beluga black

Ultralight mummy bag built for fast-and-light backcountry missions where thermal efficiency and packability are critical.

The Sea to Summit Spark -1°C is a men's mummy sleeping bag designed for performance-oriented backcountry use. RDS-certified 850+ fill power goose down with Ultra-Dry Down treatment provides reliable warmth and improved moisture resistance in damp field conditions. The 10-denier Nylon shell and lining keeps weight minimal while a waterproof-breathable hood and footbox add targeted protection where it matters most.

Features

• 850+ fill power RDS-certified goose down with Ultra-Dry Down treatment for improved water resistance

• 10-denier Nylon shell and lining with waterproof-breathable hood and footbox

• Mummy fit with generous footbox and technical hood for thermal efficiency

• Half-length #5 zip with zip-plow and two sliders for ventilation control

• Box wall baffle construction on upper half; sewn-through quilted construction on lower half

• Standard front draft collar; QuiltLock system integrates with Sea to Summit quilts

Technical Specifications

• Insulation: 850+ loft Ultra-Dry Goose Down, RDS-certified

• Shell and lining: 10-denier Nylon

• Temperature rating: -1°C / 30°F

• Body length: 198 cm (Long)

• Packed size: 165 × 145 × 112 mm

• Weight: 536 g