Twin Size Feather Bed 39 in. x 75 in.. The blue arrow shows the feather bed as it lays on top of the mattress. Our feather beds are wonderful! They have an incredible 4 in. depth! The baffles are spaced approximately 12 in. apart to provide luxurious comfort and keep the feathers and down where they need to stay. The outer fabric is a fine featherproof cotton twill weave. The bottom layer of our feather bed is filled with 90 percent feathers and 10 percent down. The top layer is generously filled with Lyocell Down Select for durability. Our feather beds are hypoallergenic, anti-bacterial and yes, even washable.