The most formal fabric for evening gloves is kidskin (young goats leather). The most expensive opera length gloves are custom-made of kidskin. Many other types of leather, most usually soft varieties of cowhide, are used in making full-length gloves; patent leather and suede are especially popular as alternatives to kidskin, and are often more affordable than kidskin. Satin and stretch satin materials are extremely popular, and there are mass-produced varieties as well. More unusual glove materials include leathers made from salmon, python, and stingray.