Bernat Sox is a light fingering, 3 ply sock yarn available in adorable, fashionable colors. Its a mix of acrylic and nylon which makes it soft but super strong and durable. Knitters love that its easy to care for and machine washable. Knit up gloves, hats, shawls and of course socks!, Bernat Sox is a popular light fingering, 3 ply sock yarn available in adorable, fashionable colors. Its a mix of acrylic and nylon which makes it soft but super strong and durable. Knitters love that its easy to care for and machine washable. Knit up gloves, hats, shawls and of course socks!