The Montane Slipstream GL Jacket shares a common thread with the first ‘old favourite’ review in that this too is a pertex garment. As you may have gathered in the previous blog I’m quite a fan of this brilliant windproof material. Essentially the Slipstream jacket is an ultra-light, single-layer windshirt made with the very lightest pertex available: Pertex Quantum Gossamer-Light. Montane, like Rab, are a British company which designs in the UK but manufacturers abroad. They have an established reputation with outdoor professionals and their products are deservingly popular with mountain rescue teams, the emergency services and the military. Montane specialises in windshells, softshells, hard-shells and pertex and pile garments.