These are very comfortable and after awhile you don't notice it's on. The material is very stretchy and the cup that comes with it is very comfortable (well, as comfortable as a cup can be). I read the review below where it ripped and I think I see the source of that problem. When you get these, just look on the inside. You'll see the left over string hanging there. Just tie it up in a bunch of square knots and you're good to go! I've used these 3 times now (and washed them) with no seam problems to report. Like the review says below, if you sew (bachelor's survival skill 101) you'll be just fine. I'd have given these a 5-star rating if it weren't for this little flaw. Two thumbs up on these. Very comfortable cup.