The tees will stretch a little with wear, but it's also important to note that they will shrink about 1" in length on the first wash so keep that in mind. As to your comment on whether they're too hot for the summertime, in my opinion (which I suppose is slightly biased) I dont think so at all. The weight just gives the fabric a nice heft, but it doesnt make the tshirt hot. It still breathes well since it's 100% cotton. I wear mine through the NYC summertime without issue.