Fixed cushions are simply that - they are part of the sofa and cannot be removed. Chosen for a sleek look they tend to be slimmer and firmer.
Loose cushions are separately upholstered pieces that can be moved around. Unlike the fixed cushion the loose cushions' covers can be removed and cleaned. These cushions have a different variety of comfort styles starting from firm to spring down to the luxurious down filled.
Bench Seat is a single cushion that spans the entire width of the sofa. The simple interpretation is a timeless classic.
The Box cushion is an architectural piece that has clear defined edges and can be enhanced by a welting (piping) using the same fabric or using a contrast fabric to add a pop.
The T cushion is an extension of the box cushion wherein the cushion wraps around the sofa's arm on both sides. The J and L cushions are used to wrap the Left or right sofa arms.
Waterfall cushion is one in which the seat fabric contniues to the front edge with no seam. It creates a softer look.
Knife Edge Cushion is a cushion where the back and front fabric meet in a crisp edge. Typically used for backs and pillows.