Knit with 100% naturally colored alpaca yarn. The yarn is the natural color of the animal fiber, no dyes! Because the fiber is not dyed, the black is not a jet black, it can appear as a very dark brown in some lighting and situations. Also, the white is not a bleached white, it is near ivory in color. The classic cap comes in one size fits all and fits most heads. I haven’t seen it not fit, but I guess anything is possible. You can wear it with the collar down around the neck or you can flip it up. Each item is lovingly, handmade by myself once your order is placed. Animal fiber can irritate sensitive people. Hand wash only when necessary. Please visit woollywhotknots.com for other made to order items and ready to ship inventory.