An Ice Helmet is used to protect your Blockhead from harm.
A Blockhead can wear an ice helmet by dragging the item into the Blockhead's clothing slot for a hat. The Blockhead then takes a slightly reduced amount of damage. An ice helmet will wear out naturally, but will wear out even faster when the wearer is taking damage from creatures, elements (i.e. cold or heat), or other players.
Ice armor helps to reduce a Blockhead's body temperature, making it useful for mining near the center of the world.
An ice helmet resembles a tin helmet, but has a bluer tint. When dropped, it is somewhat translucent.