This is a Nike Aeroswift running shirt. It's made of a lightweight, quick-drying, and breathable material! Size: Women's M Condition: New, only tried on. I think it can be used for marathons, running, various training, etc. If you have any questions, please comment. Thank you. Running shirt Running shirt Full marathon Oregon Project Track and field Track and field Tank top Ekiden (relay marathon) Marathon Uniform Singlet Aeroswift Women's