Rapha Thermal Base Layer Built with Polartec® technical performance fabric, the Rapha Thermal Base Layer actively manages moisture to help regulate body temperature as your effort changes. Exceptional breathability, moisture management and fast drying help prevent the clammy feeling that can come with traditional winter base layers, keeping you comfortable when you're working hard or temperatures fluctuate. The result is dependable warmth without overheating, making it ideal for riders who find a thermal base layer with an integrated snood simply too warm or restrictive. Soft, low-profile comfort A soft, textured fabric and flatlocked seams provide comfortable next-to-skin wear while minimising bulk underneath your cycling kit. The regular crew neckline gives you the coverage you need without irritation, while the close-fitting design sits discreetly beneath all Rapha jackets and long-sleeve jerseys. Wear it under a Rapha long-sleeve jersey for an extra layer of warmth in cool conditions, or pair it with a Rapha jacket when temperatures drop towards the lower end of the 5?13°C range.