Thick Skin

The Thick Skin is a treasure in Pikmin: The After Years. It is a white wool held by the Waterwraith on the final sublevel of Wraith World. It will grant the leaders the Frostproof ability upon collection, rendering them immune to ice, effectively negating the fear of getting hurt while destroying ice geysers or fighting enemies such as the Icy Bulblax or Cyan Glorb.