Itrsquos a bird itrsquos a plane no itrsquos a pair of heat holders dc comics superman slipper socks these superman costume styled slipper socks have the twin super powers of built in thermal heat retention and slip resistance ndash not because they come from krypton but because heat holders are the ultimate thermal clothing brand heat holders dc comics superman slipper socks have all the warming qualities of classic heat holders thermal sock soft brushed linings but with added an