Finding the right midlayer that keeps you warm (but not too hot) and layers well under a shell (not too bulky) isn’t easy. The streamlined, grid-fleece Katinka Hoody does it all well. Wear it on the climb uphill (it’s breathable and wind resistant), then throw a shell over the top for the way down. This fleece doubles as a great around-town piece, too. A drop tail gives you a nice long fit and there’s a perfect pocket for your phone.