The price and the weight of the Gamma MX (560g, small) mark this out as a jacket for technical winter use. And, being made by Canadian superbrand Arc’teryx, it would seem likely to succeed in that ambition. The Fortius 2.0 fabric (nylon on its face, polyester in its backer, with elastane mixed throughout) is stretchy and of a robust thickness, making it effective at trapping warmth (a little too effective outside of winter, in fact), as well as highly wind and water resistant. The details throughout are as you’d expect for the price, with a light and luxurious insulation covering the inner, a soft brushed-lined collar and a helmet compatible hood that’s easy to adjust, doesn’t restrict movement and acts as a very effective barrier to the elements. It boasts five pockets (hand, chest, shoulder) to carry everything from maps to ski passes, and some nicely judged choices in the spot-on elasticated wrists but handy fitted adjusters on the hem. Breathability is very impressive despite the comprehensive insulation, but this remains most definitely a winter garment, and a luxurious one at that.
VERDICT: An elegant and tough design for cold weather activities.
BEST FOR: Heavy winter use.
Review by Dan Aspel @mountainmeeple