Cosyfeet Donna Extra Comfy Womens Mule Slipper. These slippers are amazing as not only are they extremely comfortable due to their soft wool design but they are also very stylish, many health experts recommend these slippers when there are problems with the feet as the comfort is sure to help prevent swelling and much more. Their design will keep you warm during winter and cooler during summer making them very cosy to wear all year round.