(Material) What is an oil cow?

What is an oil cow?

An oil cow that is soft and comfortable to wear. It is used for items that are supple and softest and are conscious of racing, and items that require ease of wear.

The texture that is not too light reduces fluttering during riding and reduces wind stress.

What is cow? A female cow over two years old. The characteristics are soft overall, and the texture is fine and soft.