The Sea to Summit Ascent AcII 15°F sleeping bag is a highly versatile down bag designed for three-season use. It combines warmth, comfort, and adaptability by allowing users to unzip and configure it in multiple ways, including full quilt mode. Featuring 750+ fill power Ultra-Dry goose down, it offers excellent insulation even in damp conditions. The bag’s relaxed mummy shape allows greater freedom of movement, making it ideal for side sleepers or those who prefer a bit more room without sacrificing thermal efficiency.

• Triple-zip Free-Flow system enables full or partial unzipping, including footbox venting

• 750+ fill power RDS-certified Ultra-Dry goose down resists moisture and maintains loft

• Relaxed mummy shape for a balance between comfort and warmth

• Weighs approximately 2.4 lbs (1.1 kg); packs down to about 6 liters

• Vertical baffles on the upper body help reduce down migration and cold spots

• Internal stash pocket for small valuables

• Draft collar and technical hood seal in warmth