Most socks are blends of two or more yarns (or fibers), in order to take advantage of the benefits of each.  Below are descriptions of some of the sock yarns and their benefits.

Acrylic

• Manufactured fiber that keeps its shape well, dyes well, and is long wearing.
• Adds softness and bulk to socks.
• Easy to care for and has low shrinkage.
• Wicks sweat away from the foot for evaporation.  In some sock blends, acrylic is used next to the foot for its wicking ability and an absorbent fiber such as cotton is used on the outside to absorb the moisture.

Cotton

• Natural fiber that is soft and heat-resistant.
• Absorbs moisture from the foot.
• Is breathable and adds shock absorbency.

Duraspun™

• Transports moisture away from foot to keep it dry.
• Retains resilience and is durable.

Linen

• Natural fiber that is strong, durable, and able to absorb moisture.
• Often used to add strength to socks.

Lycra

• Manufactured fiber that adds strength and stretch to socks.
• Used to help socks cling to the foot and leg, and to give more size range to the style.
• Often used in socks for sports activities for extra support.

Nylon

• Manufactured fiber that is durable, dyes well, and is shrink resistant.
• Often used in "blends" to add stretch and strength to a sock.   Areas of high wear such as toes and heels may be made of nylon to help the socks last longer.

Polyester

• Manufactured fiber that dries quickly and is easy to wash. 
• Used to add strength to socks.

Silk

• Natural fiber that is soft and adds luster.
• Comfortable, but not very durable.

Terry

• Often used as a "liner" in socks to increase cushioning.
• Can be used only in the foot of the sock or as liner in the whole sock.

Wool

• Natural fiber that is warm and durable.