The Nike Unitard uses stretchy fabric to help keep you moving. Knit fabric provides support, while an open back cools you down while you run. Good used condition unitard for running. Worn for a couple races, there is some light pilling at the hip from velcro and the there is a top strip of fabric at the nape of the neck that has started to peel. You could probably press it back with fabric glue - it would be helpful to prevent chafing. Otherwise no rips or stains. Size M. See photos for measurements and details.