Running Alpha: Everybody who runs/cycles year round (applies to winter sports) knows that big key of doing your favorite sports during cold is correct approach to layering, as the key objective is to - control your body temperature and your sweat You dress too much, you sweat too much, you need to drink a lot more, you get more tired, if you stop for a little bit, significantly higher risk of catching a cold etc. = you want to minimize taking layers on and off at all times as its dead weight anyways It took me 10000km+ to figure out perfect layering system for current weather around 3-7 degrees Celsius (37-42 F) Very short shorts (13inches), taller socks (ensure your achilles is protected/warm), short sleeve tshirt and sleeveless running vest + light gloves this is major alpha/breakthrough for me this season as this is perfect combination of - keeping the HR low - minimizing sweat - lightweight as wearing close to nothing - less laundry - pro/con: cant stop as you will freeze fast - you build your cold resistance like this too