This is a question from my guy
He complains of sweat patches on the front (chest area) when he wears certain T-shirts. They stay there and dry only really slowly. It doesn´t happen with all of them, just some of them. They are all cotton so I don´t know why certain T-shirts are immune to the problem.

So, what should I look for to buy a T-shirt that won´t have these wet patches ? Thickness ? Fabric blend ? Weave ? Or... ?

Thanks !