The Rab Men's Borealis Vest issues a versatile performance for mountain running, ski touring, and climbing throughout the year. It's a light softshell that stretches and breathes while providing wind- and water-resistant weather protection. A slim fit lets you layer over the vest for a bulk-free fit, and the elastic armholes stay snug as you layer. Rab added a dual-sided rear hem adjustment with a single-handed cinch that stays secure under backpacks and harnesses.