Sea to Summit Spark -1C Women's Long Sleeping Bag

The Sea to Summit Spark -1C Women's Long Sleeping Bag is a premium 3-season mummy bag designed for female adventurers who demand lightweight warmth and packability. With an EN Comfort rating of -2°C (28°F), it delivers reliable insulation for cool nights. The bag features 850+ loft RDS Certified 90/10 Goose Down treated with ULTRA-DRY Down™ for moisture resistance, ensuring loft retention even in damp conditions. The women's-specific fit provides extra insulation in the torso and foot area, while the box baffle construction over the torso and sewn-through design in the lower leg/footbox optimize warmth-to-weight ratio.

Advantages

Ultralight yet warm, this sleeping bag excels for backpacking and trekking. The 10D nylon shell with DWR coating sheds light moisture, and the 7D nylon liner feels soft against skin. The #3 YKK full-length zipper with left-side placement offers easy entry, and the included Ultra-Sil™ compression sack reduces packed volume to just 3.5 liters.

Suitable for

• Women's backpacking and camping in spring, summer, and fall
• Cool weather adventures where weight and space are critical
• Users up to 183 cm (72 inches) tall

Key specifications

• EN Comfort Rating: -2°C (28°F)
• EN Lower Limit Rating: -8°C (18°F)
• EN Extreme Rating: -26°C (-15°F)
• Fill Power: 850+ Loft
• Fill Material: RDS Certified 90/10 Goose Down, ULTRA-DRY Down™
• Fill Weight: 350 g
• Shell Fabric: 10D Nylon with DWR
• Liner Fabric: 7D Nylon
• Shape: Mummy (Women's Specific Fit)
• Zipper Position: Left
• Max User Height: 183 cm (72 inches)
• Shoulder Girth: 155 cm (61 inches)
• Hip Girth: 135 cm (53 inches)
• Foot Girth: 108 cm (42.5 inches)
• Construction Type: Box baffle (torso), Sewn-through (lower leg/footbox)
• Packed Volume: 3.5 Liters
• Season Rating: 3 Season
• Included Accessories: Ultra-Sil™ compression sack, large storage cell
• Zipper Type: #3 YKK full-length zipper

Recommendations

For optimal performance, store the bag loosely in the large storage cell to maintain loft. Use a sleeping pad with appropriate R-value for ground insulation. This bag is ideal for women seeking a balance of warmth, weight, and packability for multi-day trips.