Purchased for my eldest son at Uniqlo about 5 years ago, and worn infrequently before being worn by my second son from around 10 months to 1 year and 3 months old. It's 100% cotton. It's a set of oatmeal and mustard yellow stripes. I thought the fabric was very soft and easy to put on. There are some areas where I feel slight pilling and fuzzing of the fabric, but I don't think there are any major stains or dirt. I've washed it frequently, so the tag is a bit worn, but it still seems like it could be useful as underwear, so I'd like to pass it on to someone who needs some.