Adidas Women's By Stella Mccartney New Tennis Track Pants Black Size M by Stella McCartney. $140.00. Drawcord on elastic waist. Leg zips on cuffs. Front pockets. Regular fit. 100% nylon ripstop. Warm up and focus for your next match in these comfortable, lightweight Adidas by Stella McCartney Tennis Track Pants. Zips at the cuffs make it easy to pull them off before the first serve.. Save 44%!