I'm a former powerlifter turned runner and I'm still losing height (for reference I'm 5ft 9" and 215lbs). I have a 44" chest and ordered L/XL (40.2-45"). It's too small for me. When the straps are fully open, they are still far from a snug fit to be comfortable. I'm afraid if I run to get it and start taking deep breaths and waving my arms, this vest will quickly tear. Even without running, I can feel my lungs contracting. I feel like I'm wearing a vest that my granddaughter would love to wear. I went cheap and this is one of those purchases I would recommend spending money on. If you are smaller then this vest is probably a great vest for a medium size. running track. But if you are a tall person I would recommend looking elsewhere.
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