Below the surface of a Matrix Pool rests a structure of uncompromising strength and durability, thanks to our polymer panels with their sturdy Power Grid reinforcing design. Unlike traditional polymer pools, which use only one type of polymer, Matrix uses a two-polymer approach for unlimited flexibility. Nexus Built-In Stairs are vinyl-covered open-top Polymer and Steel Stair Systems extend the pattern of your pool's interior finish onto your steps, creating an uninterrupted, continual, elegant look. Choose from our models or create your own stair design to match your needs and your style.