Cashmere is a luxury fiber, but it doesn't need luxury care. Cashmere is the hair of the Cashmere goat and can be treated like any fine fiber. Just remember that the washing machine is not your friend in this case, nor is the dryer. Handwashing will preserve your cashmere socks for a long time to come
Washing Cashmere Socks
Fill the sink with cool water. Add a squirt of the soap. Do not use detergent. Swirl the water and soap to mix thoroughly and raise a few bubbles.
Put the socks in the water and swirl gently. If needed, rub them gently together to remove ground in dirt.
Let the socks soak in the water for a half hour or so.
Drain the water. Take the socks out of the basin while you refill the sink with clean cool water.
Put the socks back in the sink and squeeze gently to rinse the soap out. Repeat the draining and rinsing until the socks are clean and soap-free.
Gently squeeze the socks to remove as much water as possible.
Wrap the socks in an absorbent towel and squeeze to get remaining water out.
Pull the socks gently into shape and lay them flat on a towel to dry.
If you are SURE your washing machine does not add water during the spin cycle, you can put the socks in a lingerie bag and put them in the washing machine on spin only.
The enemies of any fine fibers are heat, detergent, and agitation. These are the three things that make fine fibers shrink and felt. Make sure you use only cool water, mild soap, and that you handle the wet socks gently.