Sea to Summit Spark SpII

Ultralight three-season mummy bag built for gram-conscious backpackers and alpine approaches.

The Sea to Summit Spark SpII combines a 7D ultralight nylon shell with RDS-certified 850+ loft Premium Goose ULTRA-DRY Down insulation for high thermal performance in a minimal packed footprint. An updated mummy cut adds shoulder and hip room over previous generations without compromising insulation efficiency, making it a practical choice for technical mountain approaches and multi-day backpacking.

Features

• Updated contoured mummy cut with extra shoulder and hip room

• Vertical box baffles in the torso retain down position and maximise core warmth

• Sewn-through horizontal baffles on the lower section reduce overall weight

• ½ zip with two sliders for entry and mid-section ventilation

• Draft tube and hood draft collar limit heat loss at the zipper and neck

• Includes Ultra-Sil Nano compression bag for compact packing

Technical Specifications

• Shell: Ultralight 7D nylon

• Insulation: RDS-certified 850+ loft Premium Goose ULTRA-DRY Down

• Temperature rating: +4°C (upper) / -2°C (comfort) / -18°C (lower)

• Body length: R = 183 cm / L = 198 cm

• Packed size: ø13 × 25 cm

• Weight: R = 490 g / L = 560 g