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The Castelli Pro Issue Sleeveless Base Layer is the piece the pros requested for those in-between temperature conditions that occur, like Spain in February or Belgium in April. You're not looking for warmth from your base layer, just something to move the moisture away from your body and help your race jersey perform. Castelli's 3D mesh fabric creates dead air space next to your skin, while the polyester capillary action moves sweat away keeping you dry. A wider collar fits under aero jerseys, and the flat waist hem lies flat in your shorts.