Castelli gloves fit me the same as any other of the same advertised size. The only other thing I have bought of that brand is jerseys. Not only are they about 1-1.5 size smaller, but they are much shorter too. I recently bought a castelli vest size large and it fits about 2-3 sizes smaller than the large Capo vest I have. Even compared to Assos, they still run about 1-1.5 sizes too small on jerseys.
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Arguing with ignorant people is an exercise in futility. They will bring you down to their level and once there they will beat you with their overwhelming experience.