Some things you buy will be friends for life, and although not perfect, Marmot’s Nano AS is one of them.

At only 330g (w:306g), and using Gore-Tex’s three-layer Active fabric – Gore’s most breathable yet due to its thinner membrane and superlight tricot third layer – it gives great performance without excessive weight. While it can be difficult to compare Gore’s testing and rating methods against that of other manufacturers, if how it feels is anything to go by, you’ll stay dry – and with the right base- and mid-layers – warm in almost any conditions.

Although a slim-ish fit, a couple of good layers can be worn underneath. The sleeve length is perfect and sports asymmetric cuffs, which means they drop diagonally from the inner wrist to cover the backs of your hands for added protection against the elements. The torso is short, however, and despite the Angel-Wing Movement cut, the hem can rise when arms are raised.

The hood and its adjustments are sublime. Firstly, the main zip draws the hood comfortably closed over your chin. Then, cinching up snugly to frame the face, trap warm air and keep rain out, it’s possible to move head and hood in unison without loss of vision in any direction, due in part to the peak’s nicely stiffened bill. Because it’s designed to go beneath a helmet, the hood makes this a versatile jacket whether cycling or climbing, without compromising flexibility.

There are no pit zips on the Nano, but once opened, mesh-lined pockets placed quite high on the torso allow airflow throughout the jacket. Their position also means your pack’s hip belt won’t interfere with access to their contents.

With its potential for versatility and wearability in almost all settings, the Nano AS is a great companion whether your activities are leisurely or highly aerobic.