After many washings in hot water the lycra fibers will eventually break down and become weak. It is best to let nature air dry them. Tights feature ultra suede knee patches. These patches ensure that you will not chaff and adds extra grip. Ultra suede does not like detergents.
Detergents are harsh and actually pull oils out of leather.
The result is a leather patch that will become hard or worn out before its due time. Detergents such as Tide, Cheer, All, etc. are not recommended for the leather or lycra. Washing liquids that are gentle such as Woolight are excellent. Last but not least is care due to the actual construction of the tight. The 14 oz.