I wear this with just a merino baselayer down to about 0 degrees c and i'm good. I do run a bit hot so I would imagine for some people it might be more of a 3-4 degrees + jacket unless paired with other layers. Going to get something warmer for sub zero rides but this is pretty good for cool days. I don't feel sweaty so the ventilation must be working! Looks nice too.

Exceptional product, I wish I bought one years ago! I've worn it over just a base layer and also as a mid layer under a jacket and it is very warm and comfortable. The material is great quality as is to be expected from Endura, and I have recommended it to my riding friends already!