We designed our own crib to convert into a toddler bed so we needed a mattress that did the same, we also wanted the safest mattress possible and was reasonably priced. 

This mattress is Dual firmness (firm for baby / softer for toddler). VOC free non-petroleum foam, there was absolutely no smell right out of the box. Organic cotton cover, and it is lightweight for easy changing. 

Plus it is made in the USA by a family owned company making children's mattresses for 3 generations.