Sea to Summit Womens Spark -1C/30F Down Sleeping Bag

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UOG TOP PICK—Sea to Summit has redesigned its renowned Spark sleeping bag line, featuring high-quality materials and ethically sourced down. The hood and foot box now feature waterproof material for increased protection from condensation.

Sea to Summit says: 

The Spark Women’s sleeping bag is the perfect option for lightweight adventures. Specifically designed for women, the added warmth and heat retention offers versatility and functionality. Featuring an optimal warmth to weight ratio, the Spark Women’s bag is equally compact and comfortable.

Our Verdict

The “Flame” range of women-specific bags from Sea to Summit has been replaced by the Womens Spark. To streamline the product line, all bags, regardless of gender, are now referred to as the Spark. 

 The Spark series continues to be made with high-quality materials, using 850+ ethically sourced down treated with Sea to Summit’s Dry Down coating. This coating enhances the down’s ability to loft effectively in moist conditions, repel water, and dry rapidly.

The baffle configuration remains the same, featuring vertical baffles spanning the chest to prevent down migration and horizontal baffles employed across the lower section. A draft collar has been added to help the bag retain warm air and prevent cold air from entering.

The outer fabric has been upgraded to a uniform 10-denier Nylon, eliminating the ‘see-through’ appearance of previous Spark bags. A significant improvement is the waterproof 10-denier Nylon material used at the hood and foot box. These areas are most likely to come in contact with the tent wall, which can suffer from condensation, especially in single-skin tents. This extra layer of protection keeps the down dry.

The hood has also been redesigned to provide a more ‘traditional fit’. For fans of the classic Spark, there are many changes to celebrate.

We recommend to size up if you are near the maximum height of the regular as it does fit a little short.

– Reviewed by Ultralight Outdoor Gear

Features

• Duck Down with Ultra Dry Down treatment for improved water resistance in damp conditions.
• Featuring 10 Denier Nylon and 10D Nylon, these lightweight fabrics offer breathability, protection and effective temperature regulation for premium comfort.
• 10D Nylon’s waterproof and breathable features offer added protection and prevents exposure to tent wall condensation.
• The Mummy Fit maximises thermal efficiency and offers greater heat retention with a lightweight design for warmth, compactness and comfort in the outdoors.

Specifications

Temperature Rating

• EN13537:2012 Comfort: -1°C | 30°F
• EN13537:2012 Comfort Limit: -7°C | 19°F

Regular Specs

• Weight: 591g (excludes storage bags)
  
• Fill weight: 375g
  
• Fits up to: 5.5 ft / 170cm
• Internal Width Shoulder: 142cm
• Internal Width Waist: 132cm
• Internal Width Feet: 92cm
• Compressd Size: 5L

Long Specs

• Weight: 658g (excludes storage bags)
  
• Fill weight: 430g
  
• Fits up to: 6 ft/ 185 cm
• Internal Width Shoulder: 152cm
• Internal Width Waist: 142cm
• Internal Width Feet: 102cm
• Compressd Size: 5L

Fit

• Women’s Mummy Fit: Fitted cut with generous footbox and technical hood, to maximise thermal efficiency and minimise  bulk and weight. Wider at the hips and narrower at the shoulders for a better fit and heat retention for women.

Materials & Construction

• Insulation: 850+ FILL Power, RDS-certified, Goose Down with Ultra Dry Down treatment for improved water resistance  in damp conditions.
• Fabric: 10-Denier Nylon shell and lining. 10-Denier Nylon waterproof-breathable hood and footbox.
• Zipper: Primary zip – 1/2 length #5 with zip-plow and two sliders.
• Baffle Construction: Vertical chest baffles,
  horizontal baffles lower half and base, box wall baffles top half of bag and sewn through quilted construction lower half
• Collar: Standard front draft collar.
• Hood: Technical fitted hood with soft touch adjustment. Extra deep for a cosy like feel
• Draft Tube: Single, synthetic-filled, draft  tube along the top of all zippers.
• Intergration: Pairs with Women’s Sea to Summit bags, and STS quilts.

Help & advice:

• Women’s Sleeping Bags – How do they differ?
• The Ultimate Guide to Lightweight Sleeping Bags
• Time-Saver Guide to Choosing a Sleeping Bag
• Sea to Summit Sleeping Bag & Quilt Guide
• About Sea to Summit
• The EN13537 Standard
• All About Down