The Fox Performance Collection of socks are built using state of the are polypropylene and offer superior wicking properties as well as an anatomical, athletic fit. Everything about these socks is designed around performance and function, from the flat stitch construction to the flexible mesh foot break zones. Polypropylene construction with moisture wicking Meryl Skinlife anti-itch and anti-oder protection Mesh zones throughout Flexible mesh foot break areas Anatomic arch support Flat stitch toe construction