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The Sea To Summit Ascent Sleeping Bag is as adaptable as it is comfortable, right at home at shady summer campgrounds and setting up camp after a long trek on weekend backpacking trips. The relaxed mummy gives us more room than most mummy bags, and the Free Flow Zip System offers ventilation on both sides of our torso and at the footbox for ultimate comfort. The lightweight 750-fill duck down is treated with a hydrophobic Ultra Dry Down finish to ensure tent condensation and wet campsites don't sap the warming power of the down, and the draft tubes and collar keep warmth centered around our core.