Thermore Ecodown – your synthetic down alternative

Craig McClelland


Planning to be outdoors in cold conditions with a chance of light rain? Down isn’t your only choice when it comes to insulation. There are synthetic options that can keep you warm even in damp conditions – and Thermore™ is a leading player.

Founded in Milan in 1972, the team at Thermore are global experts in sustainable insulation technology, being the first to recycle polyethylene terephthalate (PET) bottles into thermal insulation.

Ecodown™ technology (along with their sustainable footprint) makes Thermore ideal partners for us at Kathmandu.

What is synthetic down insulation?

It’s the best of both worlds – embracing the versatile, sustainable threads of synthetic down insulation, with the warmth and loft that down offers.

Synthetic down insulation is created from 100% recycled polyester. Post-consumer PET bottles are broken down into resin and reinvented as polyester fibres. These ultrafine fibres become the fill in your Thermore jacket, trapping warmth within air pockets and mimicking the insulating effects of down.

Thermore Ecodown is able to imitate the qualities of down, even when your jacket gets damp. The end result is a high performing, super-durable insulating jacket with extra resistance to water.

You can read more about our recycled polyester initiatives here. 

Woman walking in the Cuban rainforestWoman walking in the Cuban rainforest

Down vs synthetic down: why choose a Thermore Ecodown jacket?

Ecodown has many years’ research and development behind it – meeting the aim of creating a quality alternative to down insulation.

Compared to traditional down, a jacket with synthetic down loft fibres has some significant advantages, such as:

  • Keeping you insulated, even in slightly damp conditions
  • Not clumping or getting cold spots after being washed
  • Fast drying times

Ecodown is crafted in a unique multi-shaped structure that’s designed to provide superior loft, warmth and recovery when compared to down insulation.

If you have an allergy to duck or goose plumage, choosing a synthetic alternative like Ecodown is the best insulation solution.

Man hiking in Thermore jacket Man hiking in Thermore jacket

Introducing our Heli Thermore Jacket

The opportunity to harness Thermore’s Ecodown loft fibres was one we couldn’t ignore. This incredible synthetic down material is now insulating a couple of our Heli jackets, with significant benefits like:

  • The equivalent warmth of 600 fill power down
  • PETA approval as a vegan product
  • 100% recycled fibre fill
  • Drying quicker than a standard down jacket
  • bluesign® approval to ensure environmental friendliness

Browse synthetic fill products...

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