Button down closure These onesie pajamas are made of cotton, polyester and spandex, ultra soft to wear it all day, comfortable enough to lounge around the house and stretchy fit for many body types. Our union suit features button down closure, stripe fashion style, one piece loungewear jumpsuit, sturdy rib cuffs that provide stretch, crewneck, Stretchable Elastic at Bottom. Great for using as PJ's loungewear when you're at home after work and on weekends. The one piece long johns can be the perfect under layer of your clothing to make you stay warm when you work outside in cold conditions. This sleepwear is suitable for lounging, sleeping at home for all seasons.