Body mapped and designed specifically for the female form, the Airess' little sister has all the same benefits in a more compact size. Save space and save weight! Features: Designed for Women - Designed for the woman's body shape. Lightweight and comfortable - no bounce, chafe-free breathable materials, and form fitting. Secure front shoulder zippered pockets Hydration and Storage - Equipped with a 1.5L bladder for water and its quick release valve system, two storage pockets (one on each side that fit bottles and flasks up to 22oz), large main storage compartment, one back kangaroo pocket for essentials and more Adaptive Fit - Adjustable Sizing System provides a tailored, body mapped fit for all body types. Vest fit is snug and overall sizing tends to run slightly on the smaller side, so it is recommended that anyone on the higher end of a given size may want to size up! Unique Features - 360 degree reflective for runs in low visibility. Transparent zippered pocket for quick-viewing of essentials Ideal For Outdoor Enthusiasts - Perfect for Marathons, Trail Running, Hiking, Walking, Cycling, Spartan Races and Hydration-on-the-go! Specification: FIT: Adaptive Storage Capacity: 244 cu in/4 Liters Weight With Bladder: 10.68 oz/302.9 g Weight w/o Bladder: 6.87 oz/194.9g Size: XXS/M (66cm - 83.8cm) Nathan Women's Vapor Swiftra 4 Liter Race Vest