In either one or two sided models, the construction is as the name implies. Support cores, cushioning layers and quilt layers are assembled and then enclosed with two beads of binding tape.
Pillow tops can take the form of a “knife-edge” pillow top or a “super” pillow top that has a much rounder edge to the pillow structure.
Like with the tight top construction, a support core, and cushioning layers are assembled with an “inner panel” that has a strip of quilted material or “gusset” attached to it. It is then closed top and bottom with a binding tape seam or bead.
Additional cushioning is positioned on top of the “inner panel” and the quilted panel placed on top of that.
The assembly gets closed one more time with a bead of tape.
Similar in construction to the pillow top with the exception that the gusset and mattress border are attached to the inner panel with binding tape prior to assembly.
The gusset goes straight up to the quilted panel rather than being recessed farther in to the inner panel.
The mattress is closed similar to a tight top.
This construction is like a pillow top with an additional euro-like gusset attached to it with a separate binding tape bead. This construction usually has a firm foam “comfort tray” with firm rails around the perimeter and then more luxurious cushioning materials filling the “tray”.