Over 20 million Cool Nights® PJs sold. Upgrade your sleep collection with our cutest, comfiest, keep-you-cool PJ shorts. Details Pull-on elastic waistband Piping detail Three faux buttons Side pockets 4" inseam 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.