We made them from a soft and warm material. Warm your reg at hand. Please try adding a little glamor to simple clothes. ＜Size＞ One Size Fits All ＜Material＞ acrylic70% wool30% Made in Japan The knitted arm & reg warmer obtained by special knitting method may shrink in the wash. No problem to wear. If you find some yarn come out,do not cut off or if not,they may loose yarn or get holes. For 100% silk or wool ,part of the heel or fingers may become thin and worn to its delicate materials. Use a mild detergent. Machine wash gentle delicate. ( better in washing net) Do not bleach. Do not tumble dry. Smooth by hand.