81% Acrylic/17% Polyester/2% Spandex Soft sole cushioning for added comfort Moisture management and knit-in mesh for ventilation and breathability "Y" heel gore fit ASICS single tab ankle fit helps protect against irritation These low-cut socks are designed for comfort, thanks to their strategically placed cushioning sections. They also feature mesh vents on the top that help improve breathability and help keep your feet cool. Lastly, the seamless toe section is designed to help reduce chafing and blistering.