You're going on a lightweight trek, looking for thermal comfort, with a minimum weight of 619g, the Spark Pro -18°C sleeping bag from Sea To Summit is the sleeping bag you need for 3 seasons. With its 950+ loft and a zip opening all the way to the feet. Able to adapt to a whole range of conditions, it is as light as it is versatile and functional. The optimal ratio between warmth and weight makes this bag as comfortable as it is compact and easily transportable. Goose down with Ultra Dry Down treatment for better water resistance in wet conditions. Featuring a 10-denier nylon shell and lining, these lightweight fabrics offer breathability, protection, and effective temperature regulation for optimal outdoor comfort. The waterproof and breathable properties of 10D nylon provide additional protection and prevent condensation from forming on the tent walls. The Free Flow zipper system allows for temperature regulation and multiple configurations for greater outdoor freedom. The minimal 1/4-length zippers and footbox zippers are ultra-lightweight for versatility and comfort.

Sea To Summit Spark Pro -18°C Down Features:

• Temperatures: Standard EN13537
• Comfort temperature: 3°C Temperature at which a woman can sleep comfortably.
• Comfort limit temperature: -1°C Temperature at which a man can sleep comfortably for 8 hours
• Extreme temperature: -18°C Temperature at which, after 4 hours, a woman will feel cold and can lead to frostbite and/or hypothermia.
• Mummy shape
• RDS 950+ Cuin Down
• Fill WeightRegular: 310 g
  
• Fill WeightLong: 356 g
• Regular Weight: 619 g - Long Weight: 672 g
  
• Regular Dimensions: 198 cm for a person up to 185 cm tall
• Regular Shoulder Dimensions: 160 cm circumference
• Regular Foot Zone:122 cm circumference
• Long Dimensions: 225 cm for a person up to 198 cm tall
• Compressed Packed: Regular - Long: 8 L