There are so many underlays available on the market not every underlay is the same even if they are the same height.
For example you can buy an inexpensive 10mm underlay for £4.50m2 from us which is suitable for every area in the home, but there are more expensive 9mm underlays that are denser which would give your carpet more life as the more a carpet moves up and down the more the backing wears.
You will need to get right balance between budget and how you want the carpet to wear, I would always recommend buying the best underlay as this will make your carpet last longer.
We offer all the underlays that the market has to offer. If there is a specific underlay you require we can get it and will be highly competitive on price.