These calf/arm warmers are knitted from 100% alpaca fiber or 100% organic merino wool. They are super soft and warm, simple yet elegant. It has also been proven that there are many health benefits in wearing natural animal fiber. (Inquire if you are curious about specifics). The colors are the natural colors from the animals. They are not dyed. Because they are not dyed, at times the black can look almost like a very dark brown. The white is an unbleached white. See last photo for alpaca color options. Unbleached organic merino wool is available and a brown organic merino wool dyed with black walnut husks. Please ask to see the dyed wool color options. The warmers measure 16"/40cm in length when not on, they are up to a few inches shorter when on. They will fit 6"/16 cm in circumference and up to 18"/46 cm in circumference. In other words, they stretch from 6" to 18" Each item is lovingly, handmade by myself once your order is placed. Please visit woollywhotknots.com for other made to order items and ready to ship inventory. Handwash