Hello, the product is designed as a water-repellent parka, but since it is unlined, it cannot be said that it will provide sufficient warmth on its own in the harsh cold of Ankara. It would be more appropriate to use it with a thick layer underneath. The reason for the preference of polyester is the material of the outer fabric and filling of the product; the composition of the product is 70% polyester, 30% cotton. It also contributes to the water repellent feature. We wish you pleasant shopping.