A linen cap is an article of clothing that protects a Blockhead's head from the environment and limited climatic conditions.
Linen caps are the lowest form of protection for a Blockhead's head in the game. When equipped, a Blockhead's environment bar and happiness bar will steadily decrease at a slower rate than an unequipped Blockhead.
Over time, if a linen cap is equipped on a Blockhead, the cap will slowly degrade and eventually be destroyed. Linen caps are able to be dyed to customize the appearance of a Blockhead.