Underlay For Bedroom Carpet

[bond]

Looking to buy new carpet and underlay for the bedroom - a friend has Cloud 9 underlay - it makes the carpet feel so soft and comfortable, I'm quite amazed by it, even after a few years of it being laid. Is this the best one, or can anyone recommend any other? I've heard of Plushwalk 12mm, but not sure how it compares. I just want that plush soft comfortable feeling in the bedroom. Thank you all.

[MargoTester]

I've had tredaire in the past and found it good, but if you're impressed with cloud 9 and your friend recommends it why not go with that.