Which Rab down jacket to choose: a guide by activity
Mountain GroupTo choose a Rab down jacket, the first question is when you need the insulation: during a short break, for many different activities, or while standing still in the cold. The second is how much weight you want to carry. Choosing based solely on fill power leaves out a large part of the decision.
This guide compares five specific men's models: Microlight Alpine, Electron Pro, Neutrino Pro, Mythic Alpine, and Positron Pro. The figures are for size M and correspond to the indicated codes. We do not assign comfort temperatures to jackets, as they do not have an approved range here comparable to that of a sleeping bag.
Which model to choose at a glance
| Model | Weight M | Down M / FP | Choice Priority |
|---|---|---|---|
| Microlight Alpine QDB-92 | 428 g | 152 g / 700FP | Versatility |
| Electron Pro QDB-81 | 477 g | 179 g / 800FP | Balance for cold mountains |
| Neutrino Pro QDB-85 | 563 g | 212 g / 800FP | More insulation than Electron |
| Mythic Alpine QDB-45 | 313 g | 140 g / 900FP | Reduce weight |
| Positron Pro QDB-79 | 788 g | 279 g / 800FP | Insulation for more demanding conditions |
Microlight Alpine: a jacket for many outings
We would put it at the top of the list if you want to combine mountain and daily use. Its new QDB-92 version is the benchmark for this guide. If you have an older Microlight, check its code before comparing grams or construction details.
Electron Pro: the technical balance
It is our candidate when the jacket will primarily be used in cold mountains and you are looking to balance fill, weight, and volume. It is worth considering the duration of stops: stopping to drink is not the same as spending a lot of time belaying.
Neutrino Pro: more insulation for stops
Compared to Electron, it adds 33 g of down and 86 g of total weight in size M. We would consider it when having more insulation takes priority over reducing the load. This increase should not be interpreted as an exact usage temperature.
Mythic Alpine: when weight is decisive
It is the lightest in this selection. Its combination of 900FP and 140 g of fill demonstrates why fill power should not be confused with total insulation. We would choose the Mythic Alpine for gear where reducing grams and volume is a priority, also checking its Slim fit compared to the Regular fit of other models.
Positron Pro: a more specific thermal need
It is the option with the most fill and highest weight in the table. Before choosing it, clarify how much time you will spend immobile and how it will fit with the rest of your gear. It would not be our automatic choice for walking at a high pace simply because you are going to the mountains in winter.
Three questions that prevent a bad purchase
- For moving or for stopping? A layer that feels pleasant when stopping can make you sweat too much when climbing.
- With what other garments? Check that you can wear it without compressing the down and that the outer shell has enough space.
- What conditions will prevail? Wind, humidity, duration of wait times, and sensitivity to cold matter as much as the model name.
Frequently asked questions
Are down jackets waterproof?
You should not take it for granted. In these models, a water-repellent or weather-resistant fabric does not replace a waterproof jacket for persistent rain. Layering management is still necessary.
Which is the best Rab for everything?
There is no universal winner. We would start with Microlight for a variety of uses; Electron or Neutrino to prioritize insulation in cold mountains; Mythic Alpine to minimize weight; Positron for a more specialized thermal need.
See the models
Comparison Electron Pro vs Neutrino Pro · What fill power means
To keep choosing
- Rab Microlight Alpine vs Electron Pro: which to choose
- Rab Downpour vs Firewall: Mountain comparison
Sources and compared versions
Data reviewed on September 22, 2026.
Main photo: Rab / Anders Vestergaard. Neutrino Pro at a mountain camp.
