204 PREMIUM COILS -- High coil count orthopedic crib mattress with 204 durability-tested coils for premium firmness. AIRY 2-STAGE DESIGN -- 2-sided dual firmness mattress offers a firmer infant ...

Steel gauge is another metric by which you can judge the firmness of a crib mattress. Steel gauge refers to the thickness of the coil springs. Lower numbers equal thicker gauge; a thicker steel ...