For high-intensity rides or races in cool conditions, you can use this under a Gabba or jersey/vest for extra core warmth, even if it gets wet.The sleeves are long enough to interface with your arm warmers.Espeficitations:125 g/m2 48% merino / 47% recycled polyester / 5% elastane fabric gives the warmth of wool with the durability and wicking of polyester.Machine washable.Low collar. Compare prices from: Castelli in Man's Sportswear