The temperature during your day in the hills can vary greatly, and that could be down to the ambient temperature, the temperature drop at high level, windchill or walking up a steep slope and your body generating a lot of heat.
Outer layers protect you from the wind and rain
Base layers are important as they keep you warm and dry.
Gloves keep your hands warm, but put a smile on your face
A warm hat is an essential piece of year all year round
Waterproof trousers keep off the wind and rain
What to wear on your legs
Mid layers keep you warm be providing additional insulation
Gaiters keep the bottoms of your trousers dry
Neck gaiters are draft excluders for your torso