Over 20 million Cool Nights® PJs sold. No sleep collection is complete without super-comfy PJ shorts you can slip-on—these will keep you cool for a great night's sleep. Details: Wide, stretchy band. Paperbag waistband. Pockets 4" inseam Slip-on style Relaxed fit 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.