This vest is made of mesh material and is well-ventilated and cool. There are times when it's a bit awkward for us to just wear a T-shirt, right? (especially when we're middle-aged), when our stomachs show or our innerwear is transparent. It's too hot to wear anything else on top. This is the best vest for those times. The stripes on the waist band have a slimming effect. It goes well with any inner T-shirt and the price is reasonable. This is a very popular item. I highly recommend it.