This organic innerspring crib mattress by Sueno employs traditional Bonnell style coils surrounded with layers of felted organic wool and surrounded with GOTS certified organic cotton quilted to organic wool. This is a firm mattress perfect for a newborn baby. 252 coils, 15 gauge. Made for cost effectiveness with less batting than our other crib innerspring mattress by Sueno. Click HERE to read more about the best cotton and wool used in this mattress and to view the organic certifications. The natural wool acts as a natural flame retardant. Absolutely NO chemical flame retardants added! Fits all standard cribs 28" x 52". Approximately 5" thick.