The sealskinz mid knee socks are mid weight waterproof windproof and breathable making them ideal for keeping your feet dry and comfortable when additional coverage and an equal balance of warmth and breathability are required these waterproof socks have a durable outer and a merino wool lining for moisture control and comfort they also have a well elasticated ankle and instep and a y gore heel construction for excellent support and a great secure fit this mid weight sock also has a padded heel