A 3" thick Porta Crib infant mattress featuring an untreated wool puddle pad fabric outer stitched to a Solid Extra Firm Natural Rubber Inner. Wool is used for a variety of reasons including its natural temperature regulating properties, natural fire retardant properties, breathability, and its bacterial resistance. The 100% Natural dunlop proccessed rubber is the perfect support for your little one's sleeping abode.This infant mattress has an overall very firm feel. Due to this mattress being strictly comprised of untreated natural wool, its care is very low maintenence. It is recommended to use this infant mattress in combination with an organic cotton quilted pad for additional liquid protection and ease of use. Spot clean only. Spot clean using 1 part natural cleaner or vinegar to 2 parts water. This item ships out within 1- 3 days and is regularly stocked. Made here at our San Diego, CA Facility.