Sonder Bikes
Down Jackets and Synthetic Insulation
Our insulated jackets come in down and synthetic. Down gives the most warmth for its weight; synthetic keeps working when it's damp. Filoment Hoody (650 fill power, 419g) is slim enough to wear under a waterproof. Zone (700 fill power) has a tougher ripstop outer for climbing and hiking. Fantom is our warmest, with a helmet-compatible hood for winter mountains. For wet weather, Talini uses PrimaLoft® plumes with warmth for weight similar to 600 fill power down, and Heiko is windproof and packs into its own pocket.
Down Jackets and Synthetic Insulation
Down is the warmest for its weight and packs the smallest, so it suits cold, dry days and nights at camp. It loses warmth when it gets soaked. Synthetic insulation keeps most of its warmth when wet and dries quickly, so it suits damp British hills and hard-working days. Our guide to down and synthetic jackets goes into more detail.
What fill power means
Fill power measures how much a gram of down lofts. Higher fill power gives more warmth for the same weight. How much down a jacket holds matters too: Fantom has 290g of down in a men's medium, Filoment Hoody 156g. Find your perfect insulated jacket compares the range.
Designed by us, direct to you
Our gear goes directly from us to you. We design our insulated jackets here in the UK, and our warehouse team sends them straight to your door, or you can buy them in one of our stores. There are no distributors or retailers in the chain. It's how we keep making high-performing jackets at the best possible value.
Further reading
- Best Insulated Jackets for Hillwalking: Winter Warmth Guide
- Best Layering Systems for Hillwalking: Complete UK Guide
- Insulated Jackets: Down vs Synthetic Complete Guide
- Recycled Down With a Second Life
- How to Recycle Down with Alpkit: Re:Down & Continuum Explained
- Care Guide: How to Wash Down Jackets and Sleeping Bags
RE:DOWN recycled down, GRS-certified
Filoment, Fantom and Zone are filled with RE:DOWN recycled down, certified to the Global Recycled Standard (GRS). It comes from old jackets, duvets and sleeping bags and is tested to the same fill power standard as new down. Any virgin down we use is RDS certified.
A PFAS-free DWR on the outer fabric sheds light rain and snow.
PrimaLoft® synthetic insulation
Talini, Heiko, Katabatic, 0Hiro and Solace use PrimaLoft®, which keeps most of its warmth when wet and dries quickly. Talini's PrimaLoft® ThermoPlume® gives warmth for weight similar to 600 fill power down. Heiko's PrimaLoft® Silver Eco is 100% recycled.
Wash, repair, recycle
Washing a down jacket restores its loft. Use a down-specific wash such as our Down Jacket Wash, or send it to our repair and down wash service.
When it's finally worn out, send it back through Continuum and the down can become RE:DOWN.
Mountain journal
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Down or synthetic insulated jacket: which to choose and when
An insulated jacket keeps you warm by trapping still air in a layer of down or synthetic fibres. It's the...
Find your perfect insulated jacket
It's getting cold and you need a jacket to keep you warm. With several excellent options in our range from...
Recycled Down With a Second Life
The Filoment Hoody's insulation has already had one life. Re:Down collects down from worn-out jackets, sleeping bags, duvets and pillows...
How to Recycle Down with Alpkit | Re:Down & Continuum Explained
Down is one of nature’s technical materials — light, warm, packable, and tough enough to handle long winters and cold...
What Is Ethical Down?
Ethical down refers to any down that passes the highest animal welfare standards. It comes from birds that are protected...
Care Guide: How to wash down jackets and sleeping bags
With the right care, your down jacket and sleeping bag can last for years and years. Here's how to wash,...