Some of the Alexander Del Rossa Pajamas are made of a denser, thicker cotton. These are a little bit lighter summer weight and very comfortable; already my favorites after one wearing. They are well made. I have one MAJOR criticism of all the Alexander Del Rossa pajamas I have (about 5 pair so far). There are no pockets. One pocket, low on the pajama top, big enough for a cellphone would be a very favorable addition. I have added one on myself to previously purchased pairs, but of course the fabric does not match.