Castelli Aero Race 6.0 Cycling Jersey - Men's Size M - High Performance Bike Shirt for Road Racing & Training

This jersey is definitely sized as "race-cut" meaning that unless you are accustomed to a second-skin fit, this jersey will seem ridiculously small/tight. If you want a more relaxed fit, I would NOT choose this specific jersey. I am 5'10" about 163lbs. and a 38" chest, 32" waist. I bought a Medium-sized jersey. When putting the jersey on, it will seem like you need to defy physics to squeeze into it. However, once you zip it up (yes, it will be tight), the compression feels good and the material is super-stretchy. The fit relaxes bit once you wear it a bit (maybe the fabric relaxes slightly when warm??) and once you get into a riding position, it feels great. The jersey has no excess material to flap around in the wind, so if you are self-conscious of your body, or perhaps if you are sporting a "dad-bod", then this jersey is probably not going to look or feel right for you. I think it's designed for guys who have a lean, athletic build.I've ridden this jersey comfortably in summer temps (high 80 deg F) for 1-4 hours and it breathes well (I do wear a thin sleeve-less base layer in both cool and hot temps). The build quality of the jersey is top-notch and the rear pockets are right where they should be. Can you get a similar jersey for 1/2 or 1/3 the price, yes, for sure, but there is something to be said about finely designed and constructed cycling kit. And most importantly, you do feel that you can go faster (whether your bike computer tells you it's true or not) and you can't put a price on believing you can go faster when you look like you can go faster.