That’s because the membrane itself is made from polypropylene, an evolution of the same fibres used in Helly’s famous baselayers. This is really unusual, since most waterproof-breathable membranes are composed of either PU (polyurethane) or ePTFE (expanded polytetrafluoroethylene, the stuff that Gore-Tex and eVent is made from). Production of both PU and ePTFE has significant environmental impacts, with ePTFe in particular being heavily criticised. Of course, polypropylene is a synthetic fibre just like polyester and nylon – which are all thermoplastics derived from petrochemicals. So it isn’t without its downsides either. On balance, however, it seems to have fewer negative impacts than alternative membrane technologies.

“There’s lots to like about this meticulously designed jacket.”

In addition to the membrane, the garment is built with sturdy, recycled nylon and finished with a durable water-repellent treatment that is free from harmful PFCs.

Construction and Performance

This is a well-built waterproof that is packed with mountain-ready features. The hood is fully adjustable and sized to accommodate a climbing helmet, while the elevated hand pockets are placed high up so you can still access them even if wearing a climbing harness or a rucksack hipbelt. A smaller external chest pocket will accommodate a phone, and the zipper incorporates a safety whistle. The jacket itself also has an in-built RECCO avalanche rescue reflector. Underarm pit zips provide ventilation when working hard, while chunky Velcro cuff tabs ensure a secure seal over gloves. Drawcord hem adjustment keeps out chilly gusts.

In the mountains, it feels protective and reliably waterproof, whilst being roomy enough to accommodate layers without feeling too baggy. There’s plenty of length in the arms and torso for good all-round coverage, and the hood has a stiffened brim to give extra protection for the face. The nylon face fabric is certainly durable enough for general mountain use, though it isn’t as burly as some of the most robust winter-grade shells out there (Helly’s heftier Odin 9 Worlds Infinity jacket being one such example). But as an all-season jacket it is an excellent bit of kit.

Verdict

There’s lots to like about this meticulously designed jacket – not just its full array of features, but also the innovative waterproof membrane technology and the solid eco credentials. If you’re in the market for a quiver-of-one, all season shell, this is definitely worth a closer look.

Buy the Odin 1 World Infinity Shell Jacket: £460 at HellyHansen.com