This is the piece our pros requested for those inbetween conditions where the Prosecco R is too warm and the Pro Mesh is too cool, 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. Our 3D mesh fabric creates dead air space next to your skin, while the polyester capillary action moves sweat away.Key Features:Ideal for cool conditions when you need an extra layer under your jersey,100% polyester 3D mesh fabric,Reduced seaming at shoulders for extra comfort,Double layer construction at neck,15°-25°C / 59°-77°F,Weight:38g.