Ascent 900

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Four seasons sleeping bags with hydrophobic feather 650 cuins. Rab recommends its use in conditions of intense cold in any type of activity.


  • Medium weight bag for any use, thanks to its great insulation and large dimensions. Rab recommends its use for mountaineering, expeditions, trekking or hiking in conditions of intense cold. The medium size bag is for users of maximum 1.85 m. for taller people, buy size XL.

  • The European regulation EN13537 that regulates the thermal performance of sleeping bags cannot be applied to this bag because this regulation applies to bags with a filling weight of maximum 800g. This bag has a filling weight of 900gr. Parallel to this regulation Rab applies temperature studies parallel to all its bags to its bags. In this bag Rab recommends a minimum use temperature of -18ºC.

Features :

  • Semi-straight mummy cut. Wide to have freedom of movement inside. In addition, the foot area is wide and angled so that the feet have a natural position during rest.

  • Distribution of the pen by trapezoidal partitions.

  • YKK brand zipper with a length of 3/4 over the total and a luminescent puller. Protective thermal band along the entire zipper improving insulation and avoiding hooking of the trolleys.

  • Thermal collar and perimeter adjustment cord in the hood area. In addition to improving insulation it has an extra thermal adjustment band for the neck.

  • With YKK zippered interior pocket to store valuables or that you want to have nearby during sleep.

  • Sold with a wide cotton bag for storage and another compression bag for transportation during outings.


  • European pen with hydrophobic treatment of 650 cuins that provides an excellent level of insulation without increasing its weight. Includes fluorocarbon-free technology developed in collaboration with Nikwax, with this treatment the pen absorbs less water and dries faster. The pen has been assembled by hand in the UK. Feather with RDS (Responsible Down Standard) certificate that ensures that it comes from ducks and geese that have been respected and treated in an ecological way.

  • Pertex Quantum outer fabric (49g / m2, DWR 80/20, 30d / 30d) very light, windproof, breathable and prevents feather loss. Developed by Rab managing to reduce its weight compared to the original Pertex Quantum by 20%. With an excellent balance between resistance and lightness.

More Information
Season of useWinter
Ecological note (0 to 5)3 🌱🌱🌱
Ecological Certificatesamfori BSCI, EOCA, Fair Wear Foundation, RDS (Responsible Down Standard)
ActivitiesMountaineering, Trekking
Ready forAutumn, Spring, Winter
Fill TypeDown
Limit Temperature (ºC)-18
Size guideRab
Shoulder Width * Foot Width * Length (cm / in.)75 x 65 x 215 (50 cm zona de pies)
Bag dimensions (cm)26 x 45
Weight (gr.)Estándar 1510 - XL 1590
Filling weightEstándar 900 - XL 960
Made inUnited Kingdom
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