Gear and Apparel
Your gear is driven by what weather and climate conditions you ride in . Even on warm days it can be cold in the morning workouts. A pair of arm and leg warmers can be enough to make your summer cycling kit warm enough for the majority of the year. When it gets colder, consider an under-layer and a light weight jacket. Full jackets are available to keep the core warm on the coldest of days.
Perhaps the most difficult body parts to keep warm on cold days are the hands and feet. For finger protection, a lot depends on how warm your hands get while riding. Cyclists with excellent circulation can get by with basic long-finger gloves - anything much thicker may cause overheating and sweating. If your fingers are more susceptible to the cold, consider a thicker or different glove type such as a mitten design that keeps the fingers together to add warmth. It's also possible to purchase glove liners and benefit from the same layering approach you use on your torso and legs to stay warm.
Frozen toes are no fun, either. A pair of shoe covers and wool cycling socks can be sufficient even when it drops below freezing. Shoes also determine comfort. If you normally ride in thin, lightweight road shoes, consider riding in a heavier off-road pair if you have them. Off-road shoes are often thicker and much warmer. Even if you have to swap your pedals from your off-road to street bike, it's worth it to keep your feet from freezing.
Cycling shoes are shoes purpose-built for cycling. There are a variety of designs depending on the type and intensity of the cycling for which they are intended. Key features include rigidity, for more-efficient transfer of power from the cyclist to the pedals, weight, a method of attaching the shoe firmly to the pedal and adaptability for use on and off the bicycle. Most high performance cycling shoes can be adjusted while in use, via a quick-adjusting system that has largely replaced laces.