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Boasting an impressive 950+ FILL Power, RDS-certified, Goose Down with Ultra Dry, the Sea to Summit Spark Pro -1°C sleeping bag is the only option for ultralight backpacking adventures that puts comfort at the forefront. With the ability to be adapted to a range of conditions, the Spark Pro is as lightweight as it is versatile and functional. The optimal warmth-to-weight ratio makes this bag as comfortable as it is compact and easily packable.

Ultralight does not mean ultra-tight: The Spark mummy sleeping bags are snug but still have adequate wiggle room for the performance-oriented, backcountry user.

Pair up your Sea to Summit sleeping bag with a compatible liner for the ultimate sleep system. Sleeping Bag Liners

More Help? For further assistance on choosing your down sleeping bag, we have an article explaining fill power, the pros and cons of down over synthetic insulation and more info on caring for your bag available to view here: A Guide to Down Sleeping Bags.

• 950+ FILL Power, RDS-certified, Goose Down with Ultra Dry
• Down treatment for improved water resistance in damp conditions
  
• Featuring 10-Denier Nylon shell and lining fabric, these lightweight fabrics offer breathability, protection and effective temperature regulation for premium comfort in the outdoors.
  
• 10D Nylon's waterproof and breathable features offer added protection and prevents exposure to tent wall condensation.
  
• Mummy Fit: Fitted cut with generous footbox and technical hood, to maximise thermal efficiency and minimise bulk and weight.
  
• Free Flow Zip System: Primary zip - full length #5 with zip-plow and two sliders. Secondary zip - 1/4 length #3 with zip-plow and two sliders. Footbox zip - #3 with two sliders.
  
• Spark Pro -1 Vertical chest baffles, horizontal baffles lower half and base, box wall baffles top half of bag and sewn through quilted construction lower half. Spark Pro -9 Vertical chest baffles, horizontal baffles lower half and base, box wall baffle construction throughout.
  
• Fitted front draft collar: scalloped over the neck and oversized at the shoulders.
  
• Technical fitted hood with soft touch adjustment. Extra deep for cosy like feel.
  
• Pairs with Women's Sea to Summit bags.
  
• QuiltLock: Every Sea to Summit sleeping back features the QuiltLock system that uses the snap locks located at the shoulder and foot end of Sea to Summit sleeping bags plus the quilt footbox / quilt straps to secure a quilt to the sleeping bag. This adds thermal performance and versatility to your sleep system: your integrated Sea to Summit quilt now works for ultralight summer adventures and turns your three-season bag into a four-season sleep system.
• Draft tube

• Maximum User Height:  Regular: 185cm /  - Long: 198cm
• Comfort Temperature: 3°C
• Comfort Temperature limit:  -2°C
• Shoulder width:  Regular: 155cm / Long: 165cm
• Waist With: Regular: 135cm / Long: 145cm
• Foot box width:  Regular: 102cm / Long: 112cm
• Insulated collar: Yes
• Shell Fabric: 10-Denier Nylon shell and lining. 10-Denier Nylon waterproof-breathable hood and footbox. Nylon waterproof-breathable hood and footbox.
• Filling: Ultra-Dry goose down
• Fill power: 950+
• Weight: Regular: 619g / Long: 672g
• Fill Weight: Regular: 310g / Long: 356g
• Compression Size: 8L
• Zip: Left
• Draft tube