Our lightest and airiest base layer wicks moisture away from your skin, while the open mesh helps hold the jersey up and away from the skin. It's good for warm conditions, and some riders even like it on a hot day, as it allows airflow between the jersey and skin.
This is our base layer for the warmest conditions. The mesh is open to create a space on the skin for sweat to evaporate. The 10% elastane content makes it very stretchy and helps in the moisture retention so that you're always getting evaporative cooling.