They all get a hole at the top right hip/glute area. There is a seam over there. A vertical seam, right where this seam meets the top waist band is where the seam comes undone. Comfortable underware. However having a hole in all of them after maybe 10-15 days of wear each shoes that these are completely defective.

Someone who shipped/bought these (wholesaler for CK, or Amazon) probably bought or sold them at a discount knowing this issue, which is really sad. Well as about as sad as defective underware goes lol.

Summary: do not buy these from Amazon online.