Over 20 million Cool Nights® PJs sold. Take your sleep collection up a notch with our classic, keep-you-cool button-front PJ top. Details Short-sleeve Classic notch collar Contrast piping + button detail Button-front 27" on body 2" side slits Cool Nights® is made with lightweight rayon fibers that stay cool to the touch and keep the fabric from sticking to your body. 93% Rayon, 7% Spandex. Machine wash cold.