The best synthetic puffer jackets 2023: tailored insulation for cozy warmth Our selection of the best synthetic puffer jackets have been tested in the harsh backcountry winter The North Face Thermoball 50/50 Jacket review: ultra-breathable, planet-friendly insulation for frigid ascents 50/50 baffle construction means you can attack the mountain with vigor on cold days without overheating What is PrimaLoft? What is PrimaLoft? Find out exactly what this waterproof, insulated material is doing for you when you’re out exploring in all weather Advnture NewsletterAll the latest inspiration, tips and guides to help you plan your next Advnture!Contact me with news and offers from other Future brandsReceive email from us on behalf of our trusted partners or sponsors MOST READ1I'm an adventure journalist, and these are the running shoes I recommend if you're heading off-road2Details of Garmin's next watch have leaked – and I'm excited3Garmin announces huge update for your watch – including skin temperature tracking4Can you rely on a cheap headlamp for running?5Why is outdoor gear so expensive?