We have many options if you are looking for a hearth rug or extender, available in all kinds of styles and sizes. Please see our hearth rugs link for all of your options:
Here is a brief rundown of the materials used in some of them:
Fiberglass (like the Goods of the Woods Sage Green Half Round Guardian Hearth Rug
) is the most heat-resistant kind of hearth rug you will find. The fiberglass rugs can be a little pricier than others, but they will not burn or melt.
Wool (like this rug) is going to give you the next best option for protection. It is a natural fiber, so it provides more protection than the synthetic fibers and it is durable and will not melt. It does have a bit of a rough weave, perhaps not as aesthetically pleasing as a nylon rug.
Nylon (like the Goods of the Woods University Green Frizzy Fun Half Round Nylon Hearth Rug
) is next in line when it comes to heat resistance. While it is fire-resistant, if it comes into contact with embers, it may leave a melt stain on your rug. Nylon is probably the best cost-effective option, if you don't mind the risk of the melt stains.