Brooks Shield Hybrid Vest Women's (2020 Version) Never settle for a rain delay. With its cozy warmth and weather protection, the Brooks Shield Hybrid Vest lets you chase your goals while others stay home. This lightweight, insulated vest includes wind and water-resistant panels to protect you during runs. Windproof and water-resistant paneling in critical zones protects you from the weather. High warmth-to-weight ration keeps in heat without adding weight. Zippered chest and hand pockets keep valuables secure while you run. Sizing Small: 32.5-34.5" chest Medium: 34.5-36.5" chest Large: 37.5-39.5" chest X-Large: 40.5-43" chest *Measurements refer to body size, not garment size.