The Serta Classic comes in 2 vsersions:
Firm
Plush
 
If you’re looking for a firmer feeling, the Serta® Classic mattress might just be your mattress. Featuring Serta® Pillow Soft Foam, it’s specifically designed to contour and support your body. The Classic mattress is a cooling and supportive mattress that delivers the trusted comfort of Serta®. 10 Year Warranty and Adjustable Base Friendly
 
Firm Style Mattress: 
Serta® PillowSoft® Foam
This extra-soft foam gently contours the body to provide enhanced cushioning comfort.
805 Individually Wrapped Coil System
In addition to providing contouring, cradling support, this system of up to 805 individually wrapped coils features Serta’s BestEdge® Foam Encasement technology – an extradeep foam rail to help reduce edge roll-off and extend the sleep surface.
 
Plush Style Mattress: 
Serta® PillowSoft® Foam
This extra-soft foam gently contours the body to provide enhanced cushioning comfort.
805 Individually Wrapped Coil System
The Cool Twist Gel Foam  is swirled directly into a breathable foam designed to promote airflow and heat dissipation. 
In addition to providing contouring, cradling support, this system of up to 805 individually wrapped coils features Serta’s BestEdge® Foam Encasement technology – an extradeep foam rail to help reduce edge roll-off and extend the sleep surface.
 
Mattress Height/ Layers
10.5" Firm
11" Plush
Pillow Soft Foam
Cool Twist Gel Foam
805 Indivually Wrapped Coil System to prevent partner disturbance.
Best Edge Foam Encasment helps stop Slipping off Bed Edge to stop slidding off the edge
Compatible with an adjustable bed
Warranty: 10-year non-prorated
Meets federal fire-retardant safety standard
Made in Michigan- USA