Many comics fans undoubtedly have fond memories of their superhero-themed sleeping bags emblazoned with images of Spider-Man, Batman and the Incredible Hulk. But now those seem so ... 20th century. In the 21st century, we wear our superhero-themed sleeping bags.

Selk'bag, which produces "human-shaped sleeping bags," has released a Marvel line of products that allows customers to suit up (and warm up!) as Spider-Man, Captain America, Iron Man and the Hulk. They even come with detachable booties.

(via GeekTyrant)