This workout T-shirt is so feather-light, it's slightly sheer. Cut to move, the tee is longer in back to keep you covered through your squats and forward folds. A cutout on the upper back adds ventilation where you need it most. Ultralight: this tee is made with soft burnout fabric that's slightly see-through, revealing your sports bra underneath. Ventilation: a chic cutout on the back doubles as ventilation.