Sea to Summit Spark Pro Ultralight Down Sleeping Bag - 15°F, Regular
Overview The Sea to Summit Spark Pro Ultralight Down Sleeping Bag brings high-altitude warmth into a featherweight shell. Designed for...
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Sea to Summit
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Description
xOverview
The Sea to Summit Spark Pro Ultralight Down Sleeping Bag brings high-altitude warmth into a featherweight shell. Designed for backpackers, bike-packers, and touring enthusiasts, its mummy silhouette minimizes cold exposure while maximizing comfort and packability.
Why it shines in the field
This bag centers on premium warmth with a modern edge: a high-loft goose down fill, moisture-friendly treatment, and a compact profile that folds down to a tiny footprint in your pack. It’s the kind of gear that makes cool evenings feel more manageable and trips more enjoyable.
- 950+ fill power goose down with Responsible Down Standard certification, treated with Ultra-Dry Down to help loft stay strong when moisture is present
- 10D nylon shell with a PFC-free DWR finish for lightweight weather resistance
- Breathable 10D liner enhances comfort and manages moisture during sleep
Design and warmth that adapt to conditions
The bag uses a contoured mummy shape with a hood and an effective draft collar around the neck, plus oversized shoulders to maintain warmth without restricting sleep. A front draft and thoughtful zippers reduce temperature leaks while keeping movement easy.
- 15°F (−9°C) rating with full box baffles for maximum warmth, while the 30°F option uses a lighter baffle layout for weight savings
- Free Flow Zip system with a YKK #5 side zipper and zipper plow ensures snag-free operation; lighter #3 zippers at the footbox/shoulder zones minimize bulk
- Highly breathable 10D liner and 10D shell combine warmth with comfort during longer nights
Practical extras include a compact Ultra-Sil compression sack and a storage cube. Sea to Summit backs the Spark Pro with a lifetime guarantee against defects, underscoring its durability for serious travel and adventure. The bag is offered in Regular (up to 6 ft) and Long (up to 6 ft 6 in), with two temperature options to suit different climates and activities.
Who should consider it
Ideal for those who value warmth without excess weight—think three-season treks, bikepacking jaunts, and light touring. The Spark Pro can be a reliable companion when you want reliable insulation, quick packing, and a comfortable night under the stars.
FAQ
Q: What makes the Spark Pro 15°F model stand out?
A: It uses 950+ fill down with Ultra-Dry treatment and full box baffles to maximize warmth while keeping weight down.
Q: Is this bag suitable for 3-season backpacking?
A: Yes, it's designed for a balance of warmth and light weight on backpacking trips, bikepacking, and touring.
Shipping & Return
xReturns Policy
You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Shipping
We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.
Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
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