When temperatures drop, many outdoor enthusiasts ask themselves the same question: down jacket or fleece jacket – which is the better choice for hiking, trekking and mountaineering? Both jackets insulate, both are popular, but they work on completely different principles. This guide explains the key differences and helps you make the right choice for your tour.
How does a down jacket work?
A down jacket uses natural goose down as insulation material. Down creates air chambers and retains body heat particularly efficiently. The higher the fill power (cuin), the better the insulation performance with less weight.
- Strengths: Best warmth-to-weight ratio, extremely compressible, ideal for static activities and cold below -5 °C
- Weaknesses: Loses warmth effectiveness when wet, dries slowly, less breathable during high activity
Modern down jackets rely on hydrophobic, PFC-free down (e.g. Downtek™), which repels moisture better. Nevertheless, the down jacket remains primarily a rest-insulation layer: for breaks, hut evenings and dry winter days. Alpin Loacker uses this technology in its winter sleeping bags as well.
How does a fleece jacket work?
A fleece jacket is made from synthetic polyester fibers that are processed into a fluffy fabric. Unlike down, fleece barely loses its insulation effectiveness even when wet and dries much faster. This makes fleece the ideal midlayer for active outdoor activities.
- Strengths: Insulates even when wet, quick-drying, robust, easy care, good breathability
- Weaknesses: Poor packability, higher weight per warmth performance, no wind protection without membrane
If you sweat intensively – during steep climbs or on fast trails – you're better off with fleece as an active midlayer. In the layering system, fleece is the dynamic layer that you wear during ascents and supplement with a down jacket during breaks.
Merino fleece: The best of both worlds
An exciting alternative is merino fleece – a combination of merino wool and synthetic fibers. This hybrid material combines natural temperature regulation, odor neutrality and softness with the durability and quick-drying performance of polyester.
- Natural odor control → ideal for multi-day tours without a shower
- Softer on the skin than pure polyester fleece
- Better temperature regulation than synthetic fiber alone
- Particularly popular as a midlayer for trekking tours
Down jacket vs. fleece jacket: When what?
- Down jacket: Sitting, breaks, hut, dry cold below -5 °C, when weight and packability matter
- Fleece jacket: Active hiking, damp conditions, everyday jacket, robust use
- Combine both: Fleece during ascent, down at the summit rest – that's how layering works right
Our fleece jacket guide also helps with purchasing, which explains the different fleece types in detail.
FAQ: Down jacket vs. fleece jacket
Can I wear a down jacket in the rain?
With hydrophobic down, brief rain is no problem, but for persistently damp conditions, a waterproof hardshell jacket on top or the combination with a fleece jacket as a midlayer is recommended.
Is a fleece jacket windproof?
Regular fleece is not windproof – wind passes through the open fiber structure. For full wind protection, you need a hardshell jacket as an outer layer or a softshell-fleece combination.
What is lighter: down or fleece jacket?
With the same warmth, the down jacket is significantly lighter. A high-quality down jacket with 800cuin fill power often weighs less than 300 g, while an equally warm fleece jacket brings 400–600 g. For ultralight tours, down wins clearly.