With millions of tiny, super absorbent strands, these cloths can actually reach down inside the smallest indentations of any surface. Patented hemming finish keeps the cloth in its original shape with no migration of lint or threads. 80% polyester, 20% polyamide material. Machine washable up to 1000 times and can be dried in a standard dryer at a low temperature. Caution: Do not use bleach or fabric softener. 300 gsm face weight.