The base layer provides sufficient heat to stay warm in low 30s with just a winter cycling jacket on top. I’ve also worn it with just a wind jacket in the mid 40s and been comfortable all ride. Fit is slim, but comfortable with a good length to tuck into bibs. Size medium for 5’10” and 170 lbs.
Fits well with the stretchy material and very comfortable as a base layer at a damp 40 degrees F
No really it’s excellent the slight waffle pattern makes some nice loft and it is the one I reach for if the ride isgoing to flirt with the high forties and low fifties.
Using this plus the magic shell is perfect for the wet and low 40 winter seattle rides.