The Mountain Hardware Down Booties in size small feature a cozy down insulation and a durable nylon outer shell, keeping your feet warm and comfortable. The black color and sleek bootie style make them versatile for both casual and outdoor adventures. They are size small and will fit feet up to 9'10 inches long....see pic of the insole measured. They were used once a handful of years back adnd been sitting in storage since. Down is still fully fluffy!!