The fabric is called Shapeknit Boucle, it's a wipeable fabric that is designed to match and stretch with the contours of the cushion to allow for immersion and comfort. The leather alternative is called Port, and it can be easily wiped clean or disinfected. It has the look and soft feel of leather, and also has enough stretch to allow for immersion into the cushion. They are both premium choices with a 12 year warranty and it truly is a matter of personal preference. There is an upcharge for the Port fabric. You can find more detailed information here: https://www.anthros.com/blog-pain/exploring-the-luxurious-and-sustainable-fabrics-of-anthros-chairs-gabriel-shapeknit-bouclé-and-camira-port-leather-alternative