As low as €409.00

Thomas wears size L and his measurements are: height 189 cm, chest 105 cm, waist 85 cm, hips 94 cm.

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2-5 working days

Mountlite is the ultimate winter down jacket for any rest break or bivouac, very light and minimalistic in its construction. Created especially for ski touring and trekking it provides a fantastic level of thermal insulation for very little weight.

Made of lightweight and breathable Pertex® Quantum fabric and filled with 180 g of top quality 900 fill power hydrophobic down, this jacket will keep you warm in all the right spots while retaining exceptionally low weight and an impressively small size after compression. Insulated outer pockets with a layer of down will warm your hands and small essentials, while an adjustable hood will fit a helmet, protecting against wind and cold. Finishing the cuffs and the bottom of the jacket with an elastic welt increases the comfort of use at low temperatures.

Mountlite is an excellent choice if you're seeking a lightweight down jacket that provides exceptional thermal insulation, particularly after a day of intense activities. When it comes to winter gear, weight is a critical factor for both comfort and safety. That's why the Mountlite jacket is a must-have for anyone who wants to make the most out of the winter outdoor experience.

More Information
Down quality900 FP
Total weight (size M)365 g
Down weight (size M)180 g
Stuffsack’s dimensions (height/diameter)17/14 cm
Stuffsack’s volume1,6 l
Product features
  • Fill: 900 Fill Power Polish goose down, hydrophobic, PFC free, ethically sourced
  • Shell: Pertex® Quantum 28 g/m², 10-denier ripstop, DWR finish (100% nylon)
  • Liner: Pertex® Quantum 28 g/m², 10-denier ripstop, DWR finish (100% nylon)
  • 3 mm YKK® zip (Vislon) with 2 self-locking sliders
  • Adjustable hood, designed to fit over a helmet
  • Hood adjustment allowing full visibility
  • High chin guard
  • 2 zipped handwarmer pockets
  • External zipped chest pocket
  • Elastic webbing in the hips
  • Elastic cuffs
  • New, longer technical cut
  • Construction: stitched-through chamber design
  • Fits into external pocket
  • Stuffsack included
Size chart

Expert quality



Years of breeding experience, a specific climate and research facilities are the secrets behind the excellent parameters of Polish down, which is considered to be the best in the world. Despite technological advancement and attempts to make artificial insulation that would be just as reliable, down still remains unrivaled.

Ethical sourcing


We only use down from certified Polish producers. Thanks to their geographical proximity, we can monitor the production. We are absolutely sure down used by Cumulus has been ethically sourced. It is from free-range geese that have access to water. The excellent breeding conditions are also reflected in the down’s high quality.

Hydrophobic down


When in contact with water, down quickly loses its fill power and insulating properties. Hydrophobic down has a highly increased water resilience. Much more time is needed for it to lose loft and even when moist, it dries relatively quickly. The hydrophobic down used by Cumulus is PFC free.



Pertex® and Toray®, two fabrics we commonly use in our products, are made in Japan. Renowned in the outdoor world, they are both high-performers and have an impressive resilience considering their lightweight structure. At 19g/m2 Toray Airtastic® is the lightest downproof fabric in the world.



YKK® is the most trustworthy zip producer in the world, whose zips highly outperform the competition. Almost all our products feature YKK® zip - from clothing, accessories, to sleeping bags.