This is the piece the pros request for those inbetween conditions where it's neither too warm or too cool, like Spain in February or Belgium in April. Youre not looking for warmth from your base layer, just something to move the moisture away from your body and help your race jersey perform. Our 3D mesh fabric creates dead air space next to your skin, while the polyester capillary action moves sweat away.PRODUCT FEATURES:100% polyester 3D mesh fabricReduced seaming at shoulders for extra comfortWider collar to fit under aero jerseysFlat waist hem to lie flat in shorts10°-25°C / 50°-77°FWeight:48g