The Felted Soles at Mary's Little Lambs are crafted from Romney-Merino wool raised on our farm, blended with local alpaca, and reinforced with burlap in between the layers of fiber.  They are 5/16" thick with the perfect balance of comfort and strength. Naturally insulating, breathable, and water-resistant thanks to the lanolin in wool. Ideal to use in most footwear and designed to fit up to shoe size 11.  They measure 11.5", and you trim to match your shoe or boot shape using a sharp pair of scissors.