They’re just like onesies, but they also act as a sleeping bag, and they’re adult-sized (From Small to Extra-Large.) Now how cool is that?

Marvel by Selk’bag allows you to suit up and enjoy any adventure as your favorite Marvel super hero! An excellent choice for spring and summer camping as well as fun around the home, Marvel by Selk’bag features • Four heroes: Spider-Man, Iron Man, The Hulk and Captain America • Removable booties for use virtually anywhere • Four sizes to fit fans from 4’6” up to 6’4” • A 45 degree temperature rating • Award-winning Selk’bag design!

[Marvel Superhero Wearable Sleeping Bags | Via DIWT]