Active Skin 4

The Active Skin 4 serves as the entry-level gateway into Salomon's running vest lineup, stripping back the ultralight race-day fabrics of the S/Lab series in favor of sturdier materials and a lower price tag. Built around an open 3D mesh chassis with Salomon's signature Quick Link elastic sternum strap system, the vest prioritizes immediate fit adjustability and breathable contact over featherweight bragging rights. At roughly seven ounces, it carries a bit more structural heft than race-specific vests, but that extra substance yields a durable, forgiving build that resists snagging on brush during trail workouts.

Out on the trail, the vest handles up to a liter of fluid up front using the two included 500-milliliter soft flasks. While the SensiFit patterning keeps bounce minimal when fully cinched, the flask pockets can be stubborn to reload mid-run once the bottles collapse, particularly when your hands are sweaty or cold. Storage across the vest is practical rather than expansive: a modest rear zippered compartment handles a packable windbreaker and basic first aid, while dual front stretch pockets secure gels, keys, and a standard smartphone without excessive jostling.

Against competition like the Nathan QuickStart or Osprey Duro series, the Active Skin 4 wins on torso wrap and baseline stability. It lacks the expansive reach-around side pockets and featherweight feel of the higher-tier Adv Skin 5, making it less suited for full-day mountain excursions or mandatory-gear ultras. However, for weekday trail loops, half-marathon training blocks, and runners wanting a dialed bounce-free fit on a budget, it hits the utilitarian sweet spot.