The first time I tried them I was a bit concerned about the shape fitting too lose and sloppy around the legs (since mine are skinny, not like those models in the pictures, where the briefs fully wrap their meaty legs). But, after just one wash & dry, now they adapt perfectly to my body. Problem solved! Follow their advice and beware the sizing: I'm a really skinny, bony guy who had to order an L size, so, have that in mind. I wonder who orders M or S sizes from them, honestly haha. About their overall performance: they are quite comfy and breathable indeed, even in this Barcelona humid summer heat I live with. I just wish the waistband was a bit less tight. I'm sure they'll work on improving those minor issues, definitely a great purchase!