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Mountain Designs UltraTek 900 Sleeping Bag

Mountain Designs UltraTek 900 Sleeping Bag

Mountain Designs

Our lightweight UltraTek sleeping bags use DownTek® innovation to repel water from the down to maximise loft for a restful nights sleep.

Mountain Designs

Mountain Designs UltraTek 900 Sleeping Bag

Mountain Designs UltraTek 900 Sleeping Bag

Mountain Designs

Our lightweight UltraTek sleeping bags use DownTek® innovation to repel water from the down to maximise loft for a restful nights sleep.

Mountain Designs
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Designed for the adventurous hiker, our lightweight UltraTek sleeping bags use DownTek innovation to repel water from the down to maximise loft for a restful night's sleep. These bags provide the features you need without the baggage.


Design features:

  • Lightweight
  • Fine nylon shell keeps the weight down while the high density weave stops the insulation from escaping.
  • Durable YKK zips with an inner draft tube to help keep the cold air out and the warmth in and effective anti-catch zip system.
  • Cantered foot shape that is fitted to the shape of your feet.
  • Contoured neck baffles to keep the warmth in.
  • Compression stuff sack included to use while travelling to give you more room in your pack.
  • Mesh storage sack included for long-term storage at home or in the car (so the down is not being fully compressed frequently).


Ideal for:

  • Camping
  • Leisure
  • Backpacking
  • Travelling

  • Unit weight (inc. stuff sack) (approx.): 1.45kg
  • Shell: 100% Nylon (30Denier)
  • Fill: 90% Duck Down, 10% Duck Feather
  • Size: standard
  • Approx. Internal Length: 181cm
  • Approx. Width: 76cm
  • Shape: mummy
  • Construction: Trapezoid baffle
  • Temperature rating: being re-tested

  • Down Insulation: Down is soft and cuddly and exceptional at insulating you and keeping you warm. It wicks body moisture, keeping you warm and dry. It compresses down easily for packing, while retaining shape and loft. If it’s well cared for it can last a lifetime.
  • DowntekTM Insulation: Down clusters naturally trap pockets of air which in turn is what insulates you. When down comes in contact with moisture, it deflates these pockets of air, eliminating down’s ability to be the most effective insulation. DowntekTM treatment shields those insulating air trapping clusters from moisture, allowing the down to continue insulating even while wet. DowntekTM adds no measurable weight, is all natural and is environmentally safe.
  • Trapezoid Baffle Construction: This is the strongest baffle construction and the most thermally efficient design (the placement of the seams ensures that cold air does not get through the stitch placement). This design also prevents down migrating from one side of the baffle to the other, ensuring and even dispersion of insulation throughout the sleeping bag.

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