Combed cotton
Combed cotton is a type of cotton whose fibres have been brushed in order to lengthen them and make the fabric even softer, guaranteeing better quality. Socks made from this type of fabric are stretchier and more pleasant to wear.
Stretch knit
These stocks are made using elastane, an extremely stretchy material that fits the foot snugly.
Your socks may appear smaller but this is in fact just due to their increased elasticity. The knit also better withstands repeated washing.