Can I get an opinion on Naturalmat twin mattress. https://www.naturalmatusa.com/
We are considering it for our toddler
Hi Ola,
Welcome to the Mattress Forum! 
NaturalmatUSA does offer some items using high quality and durable componentry, using materials such as latex, coco, mohair and pocketed springs.
Regarding general information for choosing mattresses for children, post #2 here and the topics it links to has much more information about mattresses and children and choosing materials that are “safe enough” for children. It also includes a number of links to the better forum posts and topics about mattress and children as well including several links to topics about crib mattresses that can help you decide on a crib mattress that is the best “match” for all the criteria that are most important to you.
While these are general guidelines and not “exact” recommendations because there is no single firmness level that is always best for all children and different people or different manufacturers can have different definitions of firmness … babies and infants will generally need a firm to extra firm sleeping surface while toddlers will generally need a medium firm to firm sleeping surface and older children that have transitioned to a larger mattress and are out of the crib will generally do best on a medium to medium firm sleeping surface.
Any combination of materials that are in a suitable firmness range, are durable enough (especially if you plan to use the same mattress for other children), and that are “safe enough” for your criteria, and that are in a budget range that you are comfortable with would make a suitable choice.
Innerspring mattress (vs mattresses that use various types of foam or coir as a support core) will tend to have more “bounce” which can encourage using the mattress for a trampoline (which can be somewhat risky) although they are certainly a suitable choice in terms of suitability and durability.
Latex will be more resilient or springy than polyfoam or coir but not as springy as an innerspring.
Innersprings would be the most breathable followed by coir followed by latex but the cover and quilting materials will be the most important part of the humidity and temperature regulation of the mattress so once again any of these mattresses would make a suitable choice.
Phoenix