Adult Onesie Footie Pajamas Since 1998! We offer Batman Footed Pajamas, Spiderman Onesies, Iron Man adult onesies! You can even rock out in KISS Footed Pajamas as well our Tuxedo adult Onesie pajamas. Whatever your Onesie attitude is Jumpin Jammerz has you covered with over 250 styles of Footed Sleepwear. All made from cozy soft polar fleece and cotton.