Signature is the Ledge Lounger line that defined in-pool furniture, and it remains the widest range in the catalogue. If you have seen a chaise sitting in a few inches of water on a tanning ledge, you have almost certainly seen a Signature piece. It is the safe starting point for most pools because nearly every accessory in the range is built to fit it.
Because it is the most established line, the accessory ecosystem around it is by far the deepest. Risers to correct ledge depth, SafeGuards to protect aggressive finishes, shades for midday sun, cushions and headrest pillows all exist in Signature specific versions. That means you can adapt a Signature piece to your pool rather than adapting your expectations to the furniture.
Match accessories to the exact frame. Chaise and Chaise Deep are not interchangeable, and neither are the chair and lowback chair versions of risers and SafeGuards. Measure your ledge water depth first, then pick standard or deep.