What Our Gearhead® Experts Are Saying: "I’ve been using the Mountain Flex Hybrid Vest for cool-weather runs and it’s perfect for layering without feeling bulky. The PrimaLoft insulation keeps my core warm, while the stretchy panels breathe well and move naturally. It’s light enough to stash when you warm up, but warm enough to start in cold air."We reach for the Salomon Mountain Flex Hybrid Vest when we want just the right amount of insulation for early morning road runs and high-output workouts. Built with lightweight PrimaLoft insulation, this vest keeps our core warm without sacrificing breathability or freedom of movement. Stretch panels in key zones let us stride naturally and vent excess heat as the pace picks up. A water-repellent DWR finish sheds light drizzle, while the stand-up collar and elastic cuffs seal out chilly gusts. Finished with two secure zip pockets and a drawcord hem for dialing in fit, this vest is a versatile layer we can count on when the forecast is unpredictable but the miles are calling.