The Orthopedic VI EuroTop mattress adds the extra support you deserve, without sacrificing the support you need. This mattress comes with a polyurethane comfort layer that provides a durable and reinforced cushioning. The 504 Verti-Coils are zoned, tempered coils with SpiraLok that creates a stronger and more stable mattress to reduce motion transfer and body impressions. With SuperEdge Plus, the perimeter of your mattress has exceptionally firm foam that resists sagging.