I wear this vest for water aerobics.  I bought it because a couple of times, when the water is cold, I found I was shivering in my core.

The vest works great.  It keeps my core warm, and I'm not shivering any longer.

Two minor observations.  First, the vest has a tendency to ride up in the water.  I push it down, but it rides back up.  Second, I'm a guy, and I bought the Large size, which the website said fitted most men.  But the zipper pull is left-handed, like a woman's zipper.  It bummed me out at first, but I've gotten used to working it.  Still, if you're marketing a product for men, you should use a right-handed zipper pull.

I am a woman with a size Medium bust, Large waist, and XL hip measurement. I wish women had these items and more womens size and shapes. Fortunately the XL fit me. I want it for pool swimming, since I get so cold in'heated' pools that I avoid swimming with my kids. I have not used this yet, but it is bound to be better than nothing. The back side of the arm holes seem tight. If they give me a rub-rash I will trim the fabric. It looks like it will trim with out needing hemming.

The vest keeps the core of my body warm durning my 45 minute exercise it 82° to 84° water.

It was way too small.   XL said it fits most men and since I can wear men's medium to large, I thought it would fit.  In reality, it was probably closer to size 8 womens.

So far, so good  Keeps my upper body warm when I'm  doing pool aerobics

very nice vest.  keeps me warm and is comfortable.