The Castelli Unlimited Women’s Thermal Jersey keeps this in mind with a combination of fabrics that will keep your core warm whilst providing plenty of ventilation, so you stay dry and comfortable for longer. The body and sleeves of the jersey use the brushed fleece Castelli Warmer Fabric that provides insulation whilst letting just the right amount of air through for ventilation that doesn’t compromise warmth. The side panels use Castelli Warmer X-Stretch fabric to create a perfect fit and a jersey that will move with you.