This is a set of two mesh-type swaddles for summer. They are breathable and stretchy. The size is M. I purchased these on Mercari in the spring of 2025. The listing mentioned they were used, but they were in relatively clean condition with no stains or fraying. I only used them for a short period, so I haven't used them very many times. Please understand that these are used items and have been stored at home. Thank you!