This lightweight T-shirt is made from 4-way stretch nylon jersey Sensitive® Plus fabric with Lycra Sport®. This is a comfortable and breathable fabric that wicks moisture away to keep sweat at bay during long runs or tough workouts. The fabric's Sun-Block treatment provides extra protection from harmful UV rays on sunny days. With lightweight stretch that lets you move freely, the women's Mystery T-shirt is the perfect companion for trail running or working out on hot summer days.