Horsefeathers Birch Jacket 2017/18 Ladies Mix a military look with modern features to create a Birch jacket. It has a UltraTech 5K / 5K waterproof membrane to protect you from rain and snow. The jacket is insulated, so you can put more layers underneath it, making it a versatile and popular outfit. In addition, the extended fit ensures that you look great even during the fierce battle with the cold.