I love this baselayer. It was a bit pricey but it keeps me warms while wicking sweat when I race XC MTB or when I'm just out for longer rides. I live in the PNW and the temps here have been in the 30's-low 50's (and damp) and it's a great baselayer for this range.
It's true to size, I'm 5'4 125lbs and 34B/26 waist and bought a small. It's incredibly well made with true flatlock seams (no chaffing), fits well under my long sleeve jerseys and shipping was about a week. I would highly recommend this baselayer for anyone training in colder temps.