It's time to say goodbye to that old T-shirt you sleep in. Our short sleeve sleepshirt is the easiest thing to slip on and slip into sweet dreams. Over 20 million Cool Nights® PJs sold. Details Short sleeves Front chest pocket Online Exclusive 10" side slits for ease of movement 50" 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.