The Sea To Summit Trek -1°C/30°F sleeping bag is crafted for adventurers seeking a balance between warmth and lightness. With its down fill, this bag offers an excellent warmth-to-weight ratio, ideal for treks where every gram matters. The semi-rectangular shape provides superior comfort without compromising insulation, allowing for appreciable freedom of movement during backpacking nights. Ultra Dry Down 650 technology makes the down fill water-resistant, ensuring thermal performance even in damp conditions. The recycled polyester lining highlights Sea To Summit's commitment to sustainability, reducing the product’s environmental impact while providing unmatched softness and comfort. The Free Flow zip system offers remarkable versatility. With its two-way slider and a special opening at the foot end, it provides customizable ventilation and the ability to use the bag as a quilt. These features make the Trek -1°C/30°F an excellent companion for nights under the stars, regardless of the conditions. Specifications of the Sea To Summit Trek -1°C/30°F: Fill: DownWater-resistant Ultra Dry Down 650 treatmentLining: Recycled PolyesterShape: Semi-rectangularFree Flow Zip systemComfort Temperature: 3°C / Limit Temperature: -1°C / Extreme Temperature: -16°C. Sleeping bag Sea To Summit ---Trek -1°C/30°F Navy Blue Ocean