This is the second towel like this that I have bought. I was initally recommend to get one by a walking partner and I have to admit, when I first felt it, I didn't think that it would be absorbant enough or be able to dry me adequately.. but it does the job brilliantly. It is made from thin, silky microfibre so, once used, also returns to its dry state very quickly.
The real beauty of it though is that it is light, folds easily and packs away to a small bag which is easy to keep in your ruck-sac without taking up much room or adding hardly any weight.
Personally I think its virtually indespensable and strongly reccommend all walkers to get one.