High desity underlay and carpet advice

Hi all
I have just bought a roll end of Abingdon stainfree classic twist (aqua protec) for daughters bedroom and playroom ideal as she is special needs.
Anyway we dont like the bouncy underlay and prefer a higher density one, which I understand is better for your carpet. I have used cloud 9 super contract in the past but looking at and wondered what you think of them (and would they also be suitable for stairs at a later date)
Wilsons toughstep
Carpenter powerstep

also would the classic twist be classed as a dense pile for HSL

Thanks for any help

 

I’ve heard power step is pretty good and cloud 9 prices have increased by a ludicrous amount


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Powerstep is quite good, surprised me how better it fealt than I thought once fitted

 

Thanks both Powerstep it will be and cheaper than Toughstep anyway

@merit yes did notice cloud 9 prices increased crazy