STS – SEA TO SUMMIT Spark Women's Down Sleeping Bag – RDS

Engineered specifically for women who seek minimal weight and maximum comfort on their outdoor adventures, the SEA TO SUMMIT Spark Women's Down Sleeping Bag delivers unparalleled warmth and efficiency.

This ultralight sleeping bag features a women's-specific mummy fit: narrower at the shoulders, wider at the hips, and designed to accommodate a natural side or "figure four" sleeping position. Advanced body mapping ensures extra insulation and warmth exactly where you need it most. The 850+ fill-power goose down is RDS-certified, guaranteeing responsible sourcing and animal welfare, while the non-PFAS Ultra-Dry Down treatment provides outstanding insulation and water resistance.

Constructed with a super-breathable 10D liner and a 10D shell, both with non-PFAS DWR, it keeps moisture at bay and maintains a comfortable microclimate. The hood and footbox incorporate highly water-repellent, breathable fabric for extra protection from condensation and wind.

The Spark is perfectly suited for ultralight backpacking, bike touring, and multi-day treks. With a comfort temperature rating of 45°F / 7°C and a compressed volume as small as 3 liters (depending on model), it packs down incredibly small—ideal for minimalists and fast movers.

A technical hood, draft-resistant zipper tube, and full-length zipper (compatible with equivalent unisex models for added comfort) round out the thoughtful design. Every component, from the Bluesign®-approved shell to the certified down, reflects Sea to Summit’s commitment to sustainability and ethical production.