It's time to upgrade your old PJs. Our short sleeve sleepshirt is the easiest, cutest thing to slip on for sweet dreams. Over 20 million Cool Nights® PJs sold. Details V-neck Short sleeves Chest pocket 36" on body 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.