Why do my feet still get cold in winter cycling shoes?

The most common cause is shoes that are too tight, compressing toes and restricting circulation. Size up to allow room for thick socks and toe movement. Other causes include: insufficient core insulation (cold blood from a chilled body reaches feet last), socks that are too thick and cause sweating (damp feet get cold), and riding too hard then stopping (sweat cools rapidly). Try merino wool socks, ensure proper core layering, and consider adding chemical toe warmers for extreme cold.