The TEKO PRIMALOFT BIO BaseLINER Socks Ultralight 1.0. These thin socks are perfect to wear under any of our socks as an extra layer of insulation. Also, the crew-height design and soft Primaloft Bio make them an excellent sock for everyday use. Features: Made from the new biodegradable Primaloft Bio Very thin and warm. Very durable. An ideal baselayer to be worn under other thicknesses of socks. TEKO Lifetime Guarantee against fault of manufacture Made in Italy Made from: 98% Primaloft Bio, 2% Elastic Caring for your socks: To save energy and water, machine or hand wash at 30 degrees celsius, then air dry.