With the best volume-to-weight ratio of any vest or pack, this women's specific vest is stealthy, ultra-comfortable, functional, and fast. UD ambassador Kelly Wolf says: “The Halo is my new favorite for both training and racing. It’s super sleek, super light, and in black you look really sharp." Features Hook and loop sternum adjustability Lightweight and breathability coupled with durable stretch Comfort Cinch™ 2.0 - more minimal and adjustable Redesigned trekking pole holder minimizes bounce and snaps out of the way when not in use Specifications Volume Capacity: 11 L Weight: 175 g Materials: Flex Mono Mesh, MicroMono Mesh, Stretch Woven Nylon/Spandex With DWR Sternum Straps: Yes Ice Ax Loops: No Trekking Pole Holders: Yes Whistle: Yes Front Phone Pocket: Yes Reservoir Compatible: Yes Bottle Included: 2 Body Bottle™ 500 Reservoir Included: No Sizing at Bottom Ribs: SM: 23 - 32 in / 58 - 81 cm MD: 30 - 39 in / 76 - 99 cm LG: 37 - 46 in /94 - 117 cm