The Firefly Jacket is a high performance, five-layered, 400 gram, waterproof and windproof shell built with two colour-shifting membranes. Normally we like to say what colour the piece of clothing you’re buying is. But with The Firefly Jacket that’s not so easy. With one of the membranes infused with a phosphorescent compound, and the other built with a fluorescent compound, the jacket changes colour throughout the day and night as the light conditions change around it – so it can be anything from copper, to orange, to glow-in-the-dark green, to a yellow that’s so trippy under UV light that you look like you’ve wandered off the set of Avatar.

Of course this kind of multi-layered luminescence has been found in nature long before we existed. Possums, sharks, frogs and flying squirrels have been flexing biofluorescent fur and skin for millions of years. But you won’t find it in clothes… until now.

Built to be worn in any conditions night or day, the jacket is fully seam sealed, all the zips are waterproof, and you’ll find Velcro straps on both the cuffs that can be fastened tight in heavy rain. There’s an elasticated drawcord at the waist, and a hidden elasticated drawcord in the hood, both of which can be tightened at high speed. And the two large side pockets are protected by storm flaps that curve down at the bottom to help rain roll straight off.