Avoid cotton. If you sweat it will absorb the moisture and stay wet so you'll feel cold.
I wear a duofold base layer shirt and a regular cycling jersey over that with a cycling vest or jacket as needed.
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The Lord is merciful and gracious, slow to anger and abounding in steadfast love. - Psalm 103:8
I am a cyclist. I am not the fastest or the fittest. But I will get to where I'm going with a smile on my face.