Layer for Maximum protection
Cold weather is probably the most common reason why cyclists opt to include a base layer. It provides an extra layer of insulation and pulls sweat from your skin, which will keep you dryer and warmer. That extra layer will also help hold warmth near the body.
Pactimo has a relatively simple plan to handle temperatures between zero and 45 degrees Fahrenheit, and it actually involves very little layering. Up top, Pactimo recommends a very warm base layer—like their High Grade Wool or Thermoregulator—matched to a really warm jacket with zippered vents, like the Vertex WX-D. And that's it. No jersey. If this feels a bit warm, go with a lighter base layer. As you warm up while riding, open your jackets zippers to drop heat and you won't need to worry about shedding layers."
Thanks to the garment's anatomical cut, it's outstandingly comfortable. Designed to be worn in sub-zero temperatures, although we didn't manage to test in quite as low as the - 17° C Pactimo claims it will work in, we found this to be really effective on chilly night rides."