Sestrals Trousers

The dream of the ultralight backpacker: a pair of comfortable synthetic insulated trousers that keep you warm in wet conditions.


Sestrals Trousers

They are not only trousers

Astucas Sestrals Trousers are a pull-on style pant to be used as a core insulation piece. It allows you to:

  • Keep your legs cozy in really cold scenarios.
  • Boost your warmth while hanging around camp, cooking or resting.
  • Extend the temperature range of your sleeping bag or quilt.
Front view of the Sestrals Trousers
Back view of the Sestrals Trousers

As smooth & light as silk

The schoeller® fabric sets a new standard in ultralight fabrics. It's not only highly windproof and downproof, but it's also amazingly soft to the skin.

Bombproof insulation

Climashield® APEX is the reference in thermal efficiency among synthetic fibers.

  • Highly compressible.
  • Retains its loft after being compressed better than other synthetics.
  • Warmth to weight ratio: 0.024 CLO/(g/m2).
  • Available in two weights: 67 g/m2 (UL model) and 133 g/m2 (Max model).
  • Continuous filament construction, 100% polyester.

Clean and dry, naturally

ecorepel® technology provides a very high level of water and dirt repellence, without reducing fabric breathability, in an environmentally sound manner.

  • Water and mud repellent.
  • Ecological: biodegradable and free from fluorocarbons (PFC).
  • Wash permanent and abrasion resistant: finish last more than 30 washing cycles at 40°C.
Breaking camp with the Sestrals Trousers

A streamlined design. Functional details.

We designed the Sestrals trousers with simplicity and minimal weight in mind: a simple but effective pull-on style, no zippers and zero pockets.

However, we didn't go too far and retained a few but essential details:

  • A fully elasticated waistband keeps trousers where it should be.
  • By using a press stud ankle adjustment you can get a close fit against footwear and regulate ventilation.
Adjustable cuff of the Sestrals Trousers

Size & fit guide

These trousers are sized to be worn over hiking trousers and have a relaxed fit.


Values in centimeters

Short inseam lengths subtract 5.0 cm.
Long inseam lengths add 7.5 cm.

Buy your Sestrals Trousers


Shell color

Liner color



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