These are awesome tights for below 40 deg F riding. They are great for the variable conditions of the Northeast, often windy and wet throughout the winter. The fit was great for me in size L, I'm a slim 6'1 at 160lb. Love the reflective detailing. These keep not only your legs warm, but also your entire midsection. They really make me much less hesitant to get out there on the bike on those cold winter days!