Knitted with Opal cotton yarn. [Materials] Washable wool 38% Polyamide (nylon) 32% Cotton 30% Size is approximately 23 to 24 cm. The opening is loose, so it's comfortable to wear without being tight. As it is handmade, there may be slight variations in size. We appreciate your understanding. After completion, the item has been washed. For washing, use a net and wash at 40 degrees Celsius or less. Do not use bleach, fabric softener, or a dryer. *Please refrain from purchasing if you are looking for a perfect product like those sold commercially, as this is a handmade item. Each item is carefully knitted, but there may be uneven stitches. We appreciate your understanding of this as the charm of hand-knitting. *Packaging will basically be in a transparent OPP bag, then placed in an envelope for shipping. Please note that we cannot provide cute wrapping for gifts. Also, it would be helpful if you could leave a comment when purchasing.