Arc'teryx, a brand of Amer Sports, has introduced a climbing jacket that uses a new, proprietary face fabric called Fortius Air 20. The Proton LT Hoody jacket has been described by Arc'teryx as “the most durable and insulated climbing jacket to date.” The Fortius 20 face fabric offers hardwearing durability as well as high air permeability, enabling the development of a jacket that ideally suits climbing, snowsports or backpacking, the brand said. The Fortius Air 20 face fabric has been developed by Arc'teryx' in-house materials research and development team in collaboration with designers and fabric producers. The brand claims that Fortius 20 is more than 60 times more durable in abrasion tests than the industry standard.