Norrøna Men's trollveggen down800 super light Jacket 26/27

800-fill down in Norrøna's trollveggen line, their alpine and expedition family. Super light is the operative phrase — this compresses to about the size of a water bottle and weighs roughly what a fleece does.

Fill power measures loft per ounce, so 800-fill down gives more warmth per gram than the 750-fill in the falketind pieces. That difference only matters when you're the one carrying it, which is exactly the case this jacket is built for.

This is the layer we recommend for touring. You carry it up in a pack all day and put it on for ten minutes at the top while you transition, then it goes away again. Warmth-to-weight is the only spec that matters in that job and down wins it decisively.

The limitation is water. Down loses loft when it gets wet and takes a long time to recover. If your days are wet rather than cold and dry, look at the trollveggen warm3 pieces instead, which use synthetic fill and keep working damp.