Originally Posted by Chandne

I have a couple that I wear (base layers can be merino or synthetic depending on temps and type of ride...fast/climb/slower) made by Specialized and Rapha. I'd forget Specialized if you're not riding one (they work really well too though I got them on clearance and the branding is subtle) but the Rapha Winter Jersey is another go-to from 25-45 degrees. Colder range- I use diff thickness merino and warmer end of the range I use synthetic base layer. I even use them at 20 degrees with a thicker merino base layer. The Rapha is very versatile and comfy as well. It is pretty soft and has vents. It feels a bit too warm above 45 and sunny (cloudy is ok though the sun is intense at altitude so much warmer) unless I am doing a mellower ride.