For extreme heat, materials that can withstand high temperatures and do not retain heat are best suited for flooring. Some of the best flooring options for extreme heat include porcelain tiles, natural stone, and concrete. These materials are durable, heat-resistant, and can provide a comfortable surface to walk on even in hot weather. It's important to note that the colour of the flooring can also play a role in its heat absorption, so lighter colours are preferable for keeping the space cool.