This mattress is nothing fancy. It's fully breathable, fully hypoallergenic and fully water resistant.
The foam is 20mm thick, and is nice and firm as recommended by paediatricians, and the covers are fully removable for washing.
This is a fantastic no-frills mattress which does the job perfectly.
There are more "luxurious" mattresses available, but bear in mind, that babies require firm, flat, breathable mattresses for the best sleep. No excess padding or softness, and certainly no pillows or quilts.