The spring is a 336 Bonnel coil with 6 turns for a 7” high profile using a 13 gauge wire. The 6 ½” gauge border wire and, 24 double edge guard all around the edge of the spring give extra end and side support. We use a ¼” X ¼” plastic flex net to prevent the insulator pads from sinking into the coils so you will not feel the coils. An 8oz bumper pad in the center third to prevent body impressions, and a full 8oz insulator pad used throughout the entire mattress, then a 3/4" high density soy based foam topper.Euro topped to /2 " of 1836 soy foam The fabric is cool Air.and quilted to 3/8" + 1 1/4 " Soy based convoluted foam and 10 oz DuPont hollofil. The bottom of the mattress is upholstered with a non-skid Grip-top to stop the mattress from sliding. Triple sewed handles for easy rotation The top of the box spring is also upholstered with the non-skip Grip-top fabric to prevent the mattress from sliding. The standard 8” steel High performance semi flex box spring is available in low profile 5” or High Profile 10” at no extra cost.