Castelli Core Seamless Sleeveless Base Layer

When you’re riding in mild to warm conditions, especially if your arms tend to overheat, the Core Seamless Sleeveless Base Layer is for you. It is designed without seams, which means you’ll be able to wear it in total comfort, even under race-fit, aero jerseys.

Made from polyester and polypropylene, it offers enough stretch to let you move freely, while your arms stay cool. Meanwhile, the soft, warm blend of yarns will keep your core cosy for early starts, while also wicking sweat effectively when the day heats up or the tempo increases or and your body is working harder.

Its wide neck will sit easily under short collared jerseys and the sides and back are lighter than the front, to prevent overheating, since those areas are likely to be covered by multiple layers when you’re wearing bib shorts. All of that means that this base layer is almost unnoticeable when you’ve got it on.

• 84% polyester/16% polypropylene yarns provide softness, warmth, wicking and exceptional stretch fit
• Seamless construction means extra comfort
• Lighter weight on side and back
• Wide neck opening to fit under short-collared jerseys
• Castelli comfort rating of 8-20°C