The Wild Hare Heatwave line of vests has been developed and refined over the past 20 years. This vests features large, divided ammo pockets with reinforced stitching, an internal shoulder pocket for the optional ShockEater recoil pad (sold separately), spare shell holders with cover flap, a rear hull pouch and an internal zippered accessory pocket. The vest has a mesh body for maximum breathability, is outfitted with top quality YKK 2-way zippers and is backed by a manufacturer's Lifetime Guarantee against premature failure of material, hardware or craftmanship. Wild Hare vests use true American sizing. Refer to the size chart for proper fit. Additional features include: 1. Large gusseted double pockets easily hold a box of shells 2. Internal shoulder pocket accept ShockEater recoil pad (sold separately) 3. Rear velcro straps give a perfect tailored appearance everytime 4. Rear hull pouch with 2-way YKK zipper for easy cleanout 5. Internal zippered accessories pocket (on off side) 6. Large 2-way YKK main zipper 7. Two spare shell holders with Velcro fabric closure 8. Plenty of room on back shoulders and above breast pocket for personalization 9. Lifetime Guarantee against premature failure of materials, hardware and construction True AMERICAN Men's Sizing. Chest measurements at the armpit (inches): Youth Large (X-Small) - 30-32"; Small - 34-36"; Medium - 38-40"; Large - 42-44"; XLarge - 46-48"; 2XL - 50-52"; 3XL - 54-56"; 4XL - 58-60"; 5XL - 62-64"; 6XL - 66-68"