Boxed Double Piped Chaise Lounge Replacement Cushion – Contoured or Rounded Back Custom Chaise Lounge Cushion for your outdoor patio furniture. Boxed Style chaise lounge cushions in over 500 Sunbrella outdoor Fabrics. Each chaise lounge replacement is custom made to order to the exact size you need. No two chaise lounge chairs use the exact same replacement cushion size. Chaise Lounge Cushions found at big box stores is a one size fits all option, as well as a very limited fabric selection.