Spring Air® Back Supporter® 500 Series features a foam-encased 5-zone dual gauge Back Supporter inter-connected spring unit with 546 coils in queen size. There are several products in this line offering different quilting and comfort layers with the same coil unit. More expensive models offer natural fibers like silk, wool, cashmere and premium materials like memory foam, latex, natural latex. They come in various softness options - firm, plush and pillow tops.

Some retailers have their "exclusive" collections with minor modification in type and thickness of padding layers. When comparing models always focus on coil type and coil amount, and also presence and thickness of premium materials - memory foam, gel foam, latex. Many retailers will have different names for the same mattress in this line, so you need to focus on an actual line not a single product. To learn more about different names of the same mattress click here.