What are some tips for staying warm while biking in cold weather?

To stay warm while biking in cold weather, wear layers of moisture-wicking clothing, including a thermal base layer, insulating mid-layer, and windproof outer layer. Cover your extremities with gloves, a hat, and warm socks. Use a neck gaiter or scarf to protect your neck and face. Consider using hand warmers or heated gear for extra warmth. Keep moving to generate body heat and stay hydrated.