What do we want from a gilet? Ultimate waterproofness? Great breathability? Possibly – but most importantly, it’s likely you want it to be packable.
Luckily, the Galibier Vent Ultra gilet is supremely packable – literally compressible into a clenched fist in the medium I had on test, while it weighs a scarcely-believable claimed 59g. In a back pocket, you don’t notice it at all, and it even leaves space for a gel or bar or two, or a set of thinner arm warmers.
Such a light construction doesn’t mean it’s not up to much other than an emergency layer, either. It’s genuinely windproof, proven when I descended the Alpe d’Huez early morning ahead of the recent Prix de Rousses race, and able to keep essential body heat in even when the temperature drops into single figures.