EXTENDED COMFORT RANGE - This is Castelli's most refined windproof base layer yet. They improved the stretch and breathability of our SG0.6 Wind fabric, and dialed in the fit perfectly. Castelli like to use it on those cool days that aren’t quite enough to pull out the winter gear yet. When it’s too cold for a summer jersey but not cold enough for the full complement of winter riding gear, pull on the short-sleeve Wind Base Layer.
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