Made of Australian Merino soft natural wool, this wool insole is odorless, and is extremely soft, fluffy and gentle to the touch. Outstanding Heat Retention: The thermal conductivity is extremely low and is less likely to be affected by the change of the outside air, so the air between the hair and the hair is curled and complex, making it almost room temperature all year round.Thats why it always keeps you warm. Unlike heat that uses electricity to trap body moisture, wool has natural warmth and gentle heat retention.Recommended for those who are concerned about their health and those who are concerned about the cold. It has excellent breathability, so it wont get stuffy and keeps your feet fresh.The gaps of dense fine fibers allow air to pass through, allowing moisture such as sweat to escape easily, so you always have a smooth texture. The moisture absorption is about twice as long as cotton products, and the surface is always dry.It is also excellent to remove moisture when worn.Once the moisture absorbed is removed, it naturally wicks away when the room is dry.Solves the problem of sweating and sweaty feet.