Tjader H.wrote a review of Castelli Seamless Men's Base Layer on November 11, 2017
Familiarity: I've used it once or twice and have initial impressions
So I just moved from Southern California to Colorado and I'm having to gear up for true winter riding. This is my first true base layer and I bought it because the Castelli website listed the temp range between 50-69 degrees F. When I got them I was initially bummed when the temp range on the box stated 68-86 degrees! I was just about to return them when I decided to read the reviews once more and noticed that someone had already worn theirs down to 40 F with no problems so I decided to give it a try. My goal was to test the lower limits so I only wore the base layer and my normal summer jersey w/ arm warmers. I also brought along my wind jacket just in case. When I left the house it was 41 degrees and I was all but certain the jacket would be on before I left my driveway. I COULD NOT HAVE BEEN MORE WRONG. The temps never got above 46 and I never once even considered the jacket. Climbing out of the saddle or during hard efforts I never got overheated or clammy, 40mph descents I never got cold. Considering this thing bears an unnerving resemblance to swiss cheese, the fact that it was money the whole ride is a testament to the technology that went into it. I don't know why it works but I'm sure happy I bought two! Bring on the 30 degree temps!