Trail and Ultra runners who demand top performance from minimal gear look to the Nano(TM) Vest for training and elite level racing. Designed for runners who prioritize weight and stability above all else, the Nano(TM) vest offers a premium minimalist hydration solution with two best-in-class 500 ml soft flasks and a pack-only weight of less than 150-grams. For comfort, the 3D vent mesh encourages air flow, cushioning and breathability while size options ensure a personalized fit. For convenience, streamlined gear organization includes a secure phone pocket, stretch overflow pocket for layers and trekking pole carry. 2 x 500 ml17 oz Quick Stow Flasks: A simple solution to staying hydrated and race-ready 3D Vent Mesh: Multi-directional air flow and cushioning to maximize comfort and breathability Trekking Pole Carry: Easily remove or replace poles while running Stretch Overflow Pocket: Quickly stash or shed a layer or rain shell Secure Phone Pocket: Conveniently located for quick access with a zipper closure for added security Dual Adjustable Sternum Straps: Offer a range of adjustments for a custom, comfortable fit and increased stability Fuel and Gear Storage: Organize run essentials with pockets specifically designed for Quick Stow flasks Size small fits chests measuring 71 - 86 cm 28 - 34 inches Size medium fits chests measuring 81 - 101 cm 32 - 40 inches Size large fits chests measuring 91 - 121 cm 38 - 46 inches Collection: Running Vests Activity: Run User: Unisex Hydration Capacity: 1L34 fl oz Hydration Type: Quick Stow(TM) Flask (x2) BPABPSBPF Free: Yes Quick Link Disconnect: No Gear Capacity: 1.5L50 cu in Pack Weight: 150g0 lb 5 oz Dimensions: 34 x 29 x 6 cm 13.4 x 11.4 x 2.4 in Fits Torso: 96-116 cm38