Features: The Stratta Seat Cushion is the first foam seat cushion specifically designed to work on the Herman Miller Aeron chair. Fits snug over the seat and requiring no tools for installation; the Stratta Seat Cushion will have you sitting comfortably in under 5 min. The seat cushion has 2 of high density foam to soften the seat while still allowing your body weight to be evenly distributed over your sitting area. The Stratta Seat Cushion covers the entire seat including the hard plastic edges. Great item if you feel the chair’digging’ into your legs or thighs. Attaches via hook and loop straps to the frame of the chair. Fits many popular mesh chairs. Certified Green – uses BioFlex Foam made of a soybean derivative Available in black and two sizes. The standard Aeron chair with two dots on the back to identify its size we use the Stratta B cushion. For the XL or three dot Aeron we use the C Stratta cushion. Both are designed to fit the seated surface with a foam cushion. The Stratta Mesh-Chair Seat Cushion by Bodybilt® is designed to retrofit your Herman Miller Aeron or other mesh chair with this comfortable seat cushion. Not only does this specially-designed cushion increase seat comfort, it also reduces instances of clothing fabric pulls. Made with environmentally-friendly BioFlexTHybrid soy-based foam. Spot clean with a mild solvent, an upholstery shampoo, or the foam from a mild detergent. When using a solvent or dry cleaning product, follow instructions carefully and clean only in a well-ventilated room. Avoid any product that contains carbon tetrachloride or other toxic materials. With either method, pretest a small area before proceeding. Always rinse promptly with clean water.