Sea to Summit Spark SpIII 18 · Gray/Yellow

An ultralight and highly compressible down bag made for both men and women, the SpIII is a high-performing choice for backpackers, climbers, cyclists, and other adventurers with a lower-limit warmth rating of 18 F. It’s part of Sea to Summit’s Spark™ Series, which spans from an ultralight liner to an expedition weight mid-winter bag, and offers an exceptional warmth-to-weight ratio with 850-fill, water-repelling ULTRA-DRY Down™. Key Features: - Highly Compressible – The Spark III compresses to the size of a hand with the help of the included lightweight Ultra-Sil™ Nano compression bag.

• Contoured Mummy Shape – The mummy-style makes for efficient insulation, while the fit has been updated to provide more wiggle room or space for layered clothing, particularly around the shoulders and hips.
• 850+ Fill Power – The high loft of this bag’s down insulation keeps it lightweight yet incredibly warm in temperatures around 20 degrees, and it fends off external moisture and internal condensation with ULTRA-DRY Down™ water-repelling treatment.