With an ultra-stable flat design, we have created our most comfortable accessory chairs to date. The latest S23 models continue to benefit from our patented design with vertical legs. The S23 enhances stability and the leg adjustment system, making the use of accessories simpler. The mattress is made from lightweight, high-quality materials that provide improved breathability and comfort. The new padded headrests and backrests made of neoprene offer unparalleled luxury. Standard: Non-telescoping legs. The telescoping S23 legs are available separately. Deluxe: The Deluxe model features a new system with adjustable armrests that can be easily moved to one side or both sides. It is also equipped with a new system of telescoping spring legs for maximum adaptability.