Ultimate Direction AK Mountain Vest 3.0 Sliding rail sternum straps Bottle holsters tighten to carry phone or camera. Phone compatible pocket External stretch pocket for organization. Soft and flexible 150g mono-mesh. Unique, on-the-go trekking pole holders. Double ice axe loops Includes (2) Body Bottle 500s. Chest Size Fit Range - SMALL: 24 - 33 in. MEDIUM 31 - 40 in. LARGE 36 - 46 in. Weight: 14.0 oz Measure around bottom ribs for the best fit. Measure while wearing the clothes you intend to wear. Do not measure here around the chest. If in-between sizes, go up a size if particularly tall; down if shorter. All vests (except the Jennys) are Unisex sizing