I ordered this vest to up my walking sessions. I am 5'4" and about 135 pounds. I ordered 16 pounds which I thought was probably the max for me. It's just about right. Any heavier I think would be a bit much especially in the summer heat. My average heart rate for the same course was 103 without it and 110 with it. It's balanced very well so, while it does cause a little more stress it's balanced correctly. I got black and I think it looks pretty cool. It's soft and doesn't rub or dig even with my tank top. I think it's a great vest and a great price point. There's something about it too like a weighted blanket. When I put it on, I feel secure. Going to get one for my husband too.