Ascent Down Mummy Sleeping Bag (25°F)


Size: Regular
Sale price$399.00

Product Details

The Sea To Summit Ascent™ down mummy sleeping bag redefines what versatile means in a sleep system. Complex construction and high-quality down keep you warm when it’s cold outside, while the triple-zipper Free-Flow Zip™ system ensures you stay cool and ventilated when the weather warms.

Shaped to allow a natural sleeping position for comfort, the Ascent is light and compact enough to go everywhere your adventures may take you.


Best Use

  • Backpacking


  • 2.5 Season: 25°F (comfort range 25°F to 70°F)


  • More room between hips and knees to allow you to sleep in a natural position without compressing the down insulation and creating cold spots. Far more comfortable than narrow mummy bags for most sleepers.


    • ULTRA-DRY Down 750+ Loft 90% Down Cluster Premium Duck Down certified Responsible Down Standard (RDS)
    • Shell Fabric: Lightweight 20D Nylon Shell
    • Free-flow zipper system: full-length YKK® #5 main side zip, half-length opposite side zip, and foot zip provides unparalleled ventilation and use as a comforter.
    • Vertical baffles over the chest to prevent down shifting as you roll over in your sleep.
    • Shaped hood, oversized draft collar, and zipper draft tube keep the cold out and the warmth in.
    • Internal pocket for phone / GPS / valuables.
    • Form a snug double sleeping bag by zipping to any Altitude™, Journey™ or Venture™ sleeping bag.
    • Includes lightweight Ultra-Sil™ compression bag and storage cell.
    • Shape: Relaxed Mummy

    25°F Regular 25°F Long
    Bag Series
    Ascent 1
    Altitude 1
    Bag Weight
    1lb 14.3oz / 860g
    2lbs 0.8oz / 930g
    Compressed Volume (ASTM Standard)
    4.9 L
    6.4 L
    Compression Sack
    S - 10L to 3.3L
    S - 10L to 3.3L
    Fill Weight
    11.6oz / 330g
    13.1oz / 370g
    Fits Up To
    6 ft / 183 cm
    6 ft 6 in / 198 cm
    Season Rating
    2.5 Season
    2.5 Season
     Temperature (EN Rating) 25°F (Lower Limit) 25°F (Lower Limit)
    Women's Temp (EN Rating)
    35°F (Comfort Limit)
    35°F (Comfort Limit)

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