If you want to maintain a comfortable temperature in all weather conditions, choosing to wear a base layer is crucial.  Base layers tend to be made from either Polyester or Merino Wool, two very different fabrics which both perform a critical function; wicking, that is, drawing moisture away from your skin. What that basically means is that you don’t get damp from perspiration as you undertake your energetic walk or climb.  It also keeps any warm air next to your skin. Cotton howeveris very poor at wicking, as it tends to just absorb and hold on to any moisture.  Base layers come with short or long sleeves, the latter being a good option to keep covered up from the sun to avoid getting burned while also keeping you warmer. Layering your clothes is important, a base layer and then a mid layer – something like a light fleece under your waterproof will allow you to make the most of the outdoors in all of our wonderful British weather conditions!