When temperatures drop, many outdoor enthusiasts ask themselves the same question: Down jacket or fleece jacket – what's the better choice for hiking, trekking and mountaineering? Both jackets insulate, both are popular, yet 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 an insulation material. Down creates air chambers and retains body heat particularly efficiently. The higher the loft (Fill Power in 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 at 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. Still, the down jacket remains primarily a rest-warmth insulation: for breaks, hut evenings and dry winter days. Alpin Loacker uses this technology in their winter sleeping bags as well.
How does a fleece jacket work?
A fleece jacket consists of synthetic polyester fibers that are processed into a fluffy fabric. Unlike down, fleece loses little insulating power 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, low-maintenance, good breathability
- Weaknesses: Worse packed size, higher weight per warmth performance, no wind protection without membrane
If you sweat intensely – 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 you wear during climbs 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 robustness and quick-drying properties of polyester.
- Natural odor prevention → ideal for multi-day tours without a shower
- Softer on the skin than pure polyester fleece
- Better temperature regulation than synthetic alone
- Particularly popular as a midlayer on trekking tours
Down jacket vs. fleece jacket: When what?
- Down jacket: Sitting, breaks, hut, dry cold below -5 °C, when weight and pack size matter
- Fleece jacket: Active hiking, wet conditions, everyday jacket, robust use
- Combine both: Fleece on the climb, down at the summit break – that's how layering works right
Our fleece jacket guide also helps with purchasing decisions, explaining 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 wet conditions a waterproof hardshell jacket over it or a 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 your outer layer or a softshell-fleece combination.
What's lighter: down or fleece jacket?
At the same warmth level, the down jacket is significantly lighter. A high-quality down jacket with 800cuin fill power often weighs under 300 g, while an equally warm fleece jacket brings 400–600 g. For ultralight tours, down clearly wins.