Ledge Lounger™ LL-SG-CD-RISER-15-18.5-WH 15"-18.5" White Signature Collection Chaise Deep Riser. Our Signature Riser offers just the boost you need for the perfect outdoor day. Ledge a little deeper than the suggested range? Want to reduce the amount of water in the seat of your chair or chaise? The Signature Riser will give you the perfect lift without compromising the sleek look of your favorite in-pool seats. With an easy 5 step setup, you’ll be relaxing on the ledge in no time.