Just a note, I have both of those, a Castelli in L and the Velotec in M. Fit is very different. I cannot wear a M in Castelli because it is too short in the torso, but my torso isn't long for my height (6'). The L Castelli is tight vertically and big around, which leads to it pulling away from my stomach and chest. The Velotec fits me much better, but could be tighter. I think I could wear a S in that. Based on the tests I've done the Castelli is faster on me.

Good advice! Thanks. Need a kudos button here.

I am 155lbs and 5’ 10” .

I own a LS Galibier and it fits correctly in a M. It just seems to be cheaper lyrcra spandex stuff versus the nicer fabrics of nicer suits and the heat management is not so good for warm weather. A great road race or cyclocross suit for races around 45 deg F or so.

Interested in selling the Velotec since it's slower?

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Strava

It's nearly impossible to know until you try them on. I have an LG Canada skinsuit in S that fits great except for straggling me if I zip it all the way and the legs are short. I'm 6' and 175lb, so why should I be wearing small? And why is a Castelli short and too big around? I'm going to see if I can find someone to tailor it.

The LG suit is actually pretty fast, and it's just basic lycra. A tight fit is the most important part. I think the Castelli works a little better for me because at high altitude and not being all that fast, the Re# is low, so the trips help.

Maybe, but not at the moment. I've been keeping it for races where the officials make you put the number on the upper back-side, where the Castelli suit is just mesh.