The Karman S-Ergo 115 Lightweight Folding Wheelchair weighs only 25 lbs. and supports a weight capacity of 250 lbs. It is one of the lightest folding chairs on the market today. The S-Ergo is available in 16", 18", and 20" seat widths.Why S-Ergo: Ergonomic seating! Not just a fancy sales term, but a functional part of this chair. The seat has a slight 'S" shape to it, just like the natural body's shape. See the video below for a better picture of the ergo seating. The "S" shape provides a more natural posture and discourages the sensation of sliding forward out of the seat. This feature is a big part of this chair.S-Ergo arms: Fixed height desk-length arms are standard with wide concave armpads.S-Ergo Wheels, Axles, Casters: The S-Ergo includes 24" rear spoked polyurethane flat-free wheels with optional quick-release axles. 24" Mag wheels are optional but are not available with the quick-release axles. Spinergy 12 spoke wheels are also an option if you're looking for a sporty machine! Front casters are 7"x1" polyurethane.Frame Colors: Available in Red or Silver frame colors.Front Riggings: The S-Ergo 115 comes standard with a removable, swing-away footrest. Footrest length is adjustable and includes flip-up composite footplates. Elevating Legrests (ELR's) are optional.S-Ergo Seating: As mentioned above, Ergo refers to the "S" seat shape. A more natural seated position with the legs placed just slightly higher than the buttocks. The actual seat and back include a mesh base with silver, anti-bacterial removable cushion system that is machine washable.Folding Frame: The S-Ergo has a folding frame that includes a fold-down backrest. With it's optional quick-release axles, the S-Ergo becomes a very compact folded chair that will fit in any automobile trunk, backseat, or simple storage in a closet. Product Features Weighs only 25 lbs (without footrest) ultralight wheelchair Globally Patented S-Shape Ergonomic Seating System Fixed Armrest w/ Ergonomic Armpads Swing In/Away Removable Footrest Storage Pouch on Backrest Anti Bacterial AEIGIS® Seat and Back Cushion Breathable Mesh Seat and Back Sling Folding Backrest and Folding Seat for Compact Transporting 7″ × 1″ Polyurethane Front Casters 24″ x 1 3/8″ Polyurethane Flat Free Rear Wheels w/Ergonomic Handrim Frame Color: Rose Red or Pearl Silver Seat Width: 16″ x 17″, 18″ x 17″, 20″ x 17″ Weight Capacity: 250 lbs