Ultimate Direction® takes your next trek to new levels with the Mountain Vest 4.0. Click here for Ultimate Direction vest sizing. 4-way stretch fabrication provides comfort at any angle. Bottle holsters at chest adjust to carry phone or camera Stretch pockets for race gels and smaller items. Trekking pole attachment. New Comfort Cinch™ technology provides quick and easy adjustment. Sliding-rail sternum strap. Zippered compartment at back with zippered closure and bungee cords for added stowing. Specifications:Volume capacity: 629.76 in3 / 10.32 LWeight with bottles: 10.72 oz. / 304 g Weight without bottles: 7.27 oz. / 206 g Technologies:· MicroMono Mesh· Flex Mono Mesh: comfortably wicks away moisture· 30D Nylon 66 silicone/polyurethane· 4-way stretch Nylon/elastane with disolved thread provides added breathability 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 100% mesh. Imported. WARNING California's Proposition 65