Comfortable Seating and Easy Transfer The Flexx Series is all about comfort, support, and performance. If you are looking for an ideal custom-made wheelchair, explore the many options that the Flexx Series has to offer and find the right combination to match you and your needs. The Flexx S is equipped with many adjustable features like rear wheel axle position, backrest angle, backrest height, and seat depth, just to name a few. With the elliptical-frame design, the Flexx wheelchair is not only stylish but also robust and durable. Flexx has a folding backrest as standard for convenient storage and easy handling.