I have just received and unpacked, the mattress of Hauck for travel cot. The dimensions can be found all over the Internet - 60 x 120 cm - the height but I have never found information. That's why I bring it here for: the mattress is about 6cm high. It is lightweight, foldable in 3 parts and printed on one side with roads. When choosing, I liked the one that you can use the mattress as a game pad - even a small cloth car included - on the other hand they can be wonderfully fold up and easily transported in a bag with adjustable shoulder strap.
Unfortunately, it is harder than I had imagined and the rustling and crackling respect quite. As a game pad so no problem - ideal - to sleep but I find them uncomfortable and very hard. I'll keep them anyway because I need it and possibly put a soft blanket between the mattress and bed sheets.
Conclusion: good idea, high fun factor, very easy to transport, the price is also OK, but the cuddle factor is something missing.