The fabric mix on this item is good, it does dry out fast even in cold damp Seattle, where 100% cotton is always a risk.  I was originally looking for an even more light-weight robe than this one, and think that the label "lightweight" is to contrast with some quite heavy waffle-weave bathrobes that you sometimes see.  I have another bathrobe in thick microfiber for cold weather, but I like to have a light one around for summer.  I am 5'7" and I got the large.  It fits well except that the loops for the belt are at my hips instead of at my waist, where I prefer.  The length is good, not as long as in the product photos.