A fine rib pixie-style bonnet, secured with ties under the chin. The sizing is intended to fit close, with the rib structure giving a versatile snug fit to accommodate growing heads. About the yarn: Made from Italian-spun 100% Extrafine Merino Wool, Oeko-Tex Certified. Mulesing free. Machine wash on a cool, delicate cycle. Made in India. S - 0-9 months ( to match for size 6M) M - 9 months up to 2 years (to match for sizes 12M, 18M) L - 2 years to 6 years (to match for sizes 2Y, 4Y & 6Y)