Our Handcrafted Wool Slipper Socks are completed with an embroidery pattern of triangles around the sock opening resembling the clamshell called the cherrystone. The embroidery pattern of triangles along the sock opening is done by a special sewing machine, which a craftsman uses to embroider each sock one by one. After embroidering with the sewing machine, the craftsman finishes the distinctive shell pattern by knitting the rest by hand. Comfortable inner pile fabric contains a blend of premium merino wool, keeping your feet comfortable from the moment you put them on. • Limited Edition / Midnight Blue • The grippy dots provide traction to prevent slipping • Bestseller in Japan for over 60 years. • Extra soft and plush knit fabric on the inside. • Wear them over bare feet or as slippers over socks. • Great for gift. • Medium (US women's shoe size: 5 - 9), Large (US Women's shoe size 9 and up, Men's 8.5-11.5, ) • Machine wash cold. Do not bleach. Gentle cycle. Tumble dry low.