- Men’s onesie underwear
- Machine wash
Simplify your style with the new onesies design from Undergear®. Combining a men’s undershirt and trunks into one effortless piece, these short-sleeved onesies are the ones to count on for ultimate comfort—and a great extra layer when you need it. Made from soft cotton jersey with a touch of stretch spandex, these zip-front Undergear® onesies also offer a step-in style for easy access.