Sizing
Men's
Men's Regular : Shoe Size 7 - 10, Euro 40-45 . Foot Length 25 -29 cm
Men's King : Shoe Size 10 - 13, Euro 46-51. Foot Length 30 - 35 cm

Ladies
Ladies Small :Shoe Size  3 - 8, Euro 35 - 41.  Foot Length  22 - 26 cm
Ladies Large :Shoe Size   8 - 11, Euro 42 - 45.  Foot Length 26 - 29 cm.  
Large size only available in most popular colours
 
Children
Children's Small : Shoe Size 5-8, Age 3-5
Children's Medium: Shoe Size 9-12 , Age 5-8
Children's Large : Shoe Size 13-3 , Age 8-10
 
Unisex
Small : Ladies Shoe Size 3-8, Men's Shoe Size  4½ -7, Euro 35-41 . Foot Length 22-26cm.
Medium : Ladies  Shoe Size 8-11, Men's Shoe Size  7-10 , Euro 40-45. Foot Length 25-29cm.
Large : Men's  Shoe Size 10-13, Euro 46-51. Foot Length 30-35cm.
 
Extra Large
57C14 Extra Large Cotton Blend to fit Shoe Size 14+, Foot length 30-35cm+
67C16 Extra Large Wool Blend to fit Shoe Size 14+, Foot Length 30-35cm+
67E16 Extra Large & Wide Wool Blend to fit wide foot Shoe Size 14+, Foot Length 30-35cm+
Foot length measurements in these sizes are of limited use because a knitted fabric when stretched widthwise loses length. Thus a large wide foot less than 30cm long may need an extra large sock.