Ledge Lounger LL-MS-S-B-WH White Mainstay Sectional Base - Bring life to your outdoor space with Mainstay. This pre-assembled base can be paired with other Mainstay sectional pieces to create infinite arrangements. The base is crafted of an extruded, high density polyethylene material. It is perfect for residential or commercial settings and can withstand outdoor environments without swelling, splintering, fading, or warping.