Blacksmiths use heavy use heavy clothes and gloves so that they do not get burned
by fire. The materials do not transfer heat quickly, and therefore we call these
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O conductors
semiconductors
insulators
O convectors

insulators

Explanation:

Insulators are any substance which do not let any heat to pass through it. In other words we can say that insulators are bad conductors of heat.

Example of insulators are clothes, woods, plastic

Blacksmiths work with metals which are heated at very high temperature. If the body of blacksmiths comes in contacts of metal with high temperature, they may get severe burn. To avoid any accidents they use clothes and gloves so in case if by mistake they come in contact with high temperature, these clothes and gear do not let let pass through it and protect the body of blacksmith.  

Since these clothes and gloves do not let heat flow through it they belong to the category of insulators.

lol idk man i guess u gotta ask bill nye the science guy