The Stay Dry Trekker is a tri layer heavy duty mid thigh length waterproof & breathable jacket. Its outer shell provides a water & wind proof barrier with a DWR (durable water repellent) coating to help shed surface water. The mid layer is a breathable membrane that efficiently moves sweat and moisture through the shell fabric, keeping you comfortable and dry. The inner layer protects the breathable membrane for long lasting durable performance and comfort.