SIGNATURE SERIES 5.0: The Ultimate Direction Ultra Vest has been a mainstay at thousands of ultramarathons. The Ultra Vest 5.0 is lighter more durable, more comfortable and more adjustable than before. All front storage pockets can be accessed without removing the Vest. Featuring 2 front Bottle holsters that tighten to also carry phone or camera, 1 front zippered storage pockets for fuel or essentials, 3 stash pockets and 3 zippered back pockets. Back compression cords keep loads from shifting and hold layers in place when on the fly. Comfort Cinch 2.0 - more minimal, lightweight, and adjustable while on the go. The Race Vest moves with you thanks to the 4-way stretch material in key places. Unique Flex Mono Mesh and MicroMono Mesh provide weightless structure and support yet absorb little water or sweat that can weigh the Vest down while running. Redesigned trekking pole holder minimizes bounce and snaps out of the way when not in use. Includes two 500ml Ultimate Direction Body Bottles v2 which stow up front to give you easy access to fuel on the go. Lightweight hook and cord adjustable sternum and chest straps keep the vest from moving. Hydration bladder compatible. Emergency whistle included. Sizing at Ribs: SM: 23-32 in. / 58-81 cm, MD: 30-39 in. / 76-99 cm. LG: 37-46 in. / 94-117 cm. Specs: Volume Capacity: 10.8 L, Weight With Bottles: 6.3 oz. / 180 g. Lifetime Ultimate Direction warranty.