Chilly Dog sweaters are made using soft all-natural wool. Cozy, soft to the touch and machine washable (hang dry)...they are perfect for cool days, drafty interiors or layering under waterproof shells in wet weather. Handmade by skilled artisans in Central America using Fair Trade practices. As they are handmade, expect slight variations on sizing and color. See sizing chart for choosing best size for your pup!