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Sea to Summit improves one of its backpacking bestsellers, enhancing the Spark (pictured) and Women’s Spark with 850-plus-fill goose down that’s bound by highly breathable 10D nylon. These high-warmth, low-weight performers load premium comfort into minimal packed volume, with the Spark available in 0F, 15F, 30F, and 45F ratings (women’s to 15F) and starting at weights as low as 12.8 ounces.
Spark / Women's Spark
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Ultra-Dry Down Treatment, plus a coated water-resistant hood and footbox, prep you for better sleep in damp conditions.
Women’s Spark is engineered specifically for women, cut narrower in the shoulder and wider from hip to knee, with added warmth and heat retention for greater versatility and comfort.
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Spark Pro adds high-loft, 950-plus-fill goose down to the Spark’s thermal-efficient mummy fit. The Ultra Dry Down–treated down is spread across vertical chest baffles and a horizontal lower baffle, weighing in as low as 21.2 ounces and available in 30F and 15F options.
Spark PRO
Women’s Spark is engineered specifically for women with added warmth and heat retention for greater versatility and comfort.
Free Flow Zip System offers enhanced temperature regulation and multiple sleeping bag configurations, thanks to quarter-length secondary and footbox zips.
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Give your sleeping bag an instant thermal boost and added layer of breathability with the next evolution of the market’s top liners. The Reactor, Reactor Extreme, and Reactor Fleece feature an all-new footbox drawcord for full control over your temperature and comfort.
The reactor LINE
HEiQ Fresh treatment neutralizes body odor with a biobased amino sugar polymer to keep your liner, and your greater sleep system, fresh night after night.
Thermolite fabric (made from 50% recycled yarns) utilizes infrared technology for up to 22% increased warmth (depending on the sleeping bag) by trapping insulated air in the hollow fibers.
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