These are MUJI brand sarouel pants with knee patches. The size is 70-80. They can be worn folded up, so they can be used for a long time by both boys and girls. In the coming season, you can use these pants with just a bodysuit as loungewear, or they are soft enough to be used as pajamas, and are also easy to mix and match for daycare. I only used them for one season. Please only purchase if you understand the condition, that they are used, and that they have been stored at home.