The first mattress I got last year was 'natural latex' - and the smell!!!! ye gods it was still strong after 6 weeks. Make sure the shop has a good returns policy would be my advice. The best advice I was given was to get natural mattress covers, I have 3 on my mattress underneath my sheet and its been fine. A firm base is important to give the mattress stability, wooden slats or even better wooden slats which flex. Heaven..