Yes.
It is normal for Nike socks to have threads inside. Nike socks are knitted products and are sewn with threads of various materials. Where there are gray threads on the outside of the socks, there will naturally be residual gray threads inside the socks.
Nike generally refers to NIKE. NIKE is headquartered in Portland, Oregon, USA. The company produces a wide range of sporting goods, such as clothing, footwear, sports equipment, etc. NIKE is a world-famous sports brand. Its original meaning in English is the Greek goddess of victory, and its Chinese translation is Nike. The Nike logo is a small hook.