Sportful thermodynamic lite ss baselayera sleeveless base layer with an open mesh polyester construction for rapid moisture transfer in hot summer conditions the thermodynamic lite base layer channels sweat to the out layer for evaporation giving a fresh feeling on climbs and hard efforts features material 100 polyester light sleeveless construction open polyester mesh for maximum breathability and rapid drying flat lock stitching sportful logo graphic anatomic next to skin fit machine was