Castelli Core Seamless Base Layer Undershirt – Seamless comfort for mid-season rides
The Castelli Core Seamless Base Layer is the technical underwear jersey designed to offer warmth, breathability, and exceptional comfort during rides on cool days. Thanks to the seamless construction, it minimizes skin chafing, while the technical polyester and polypropylene yarns ensure optimal moisture management and a dry feeling even during prolonged efforts.
With a smart design, lighter on hips and back to improve ventilation, it fits perfectly under any cycling jersey or jacket, even those with a low collar, thanks to the wide crew neck.
Main features of the Castelli Core Seamless Base Layer
Advanced textile composition: 84% polyester / 16% polypropylene for an ideal mix of softness, elasticity, and thermal properties
Seamless construction: eliminates friction points for superior comfort, even in direct contact with the skin
Lightened zones on sides and back for optimal ventilation and rapid sweat evacuation
Wide crew neck: designed to fit even under jerseys with low collars
Slim fit, ideal as a first technical layer
Technical specifications
Composition: 84% polyester / 16% polypropylene
Weight: 206 g
Recommended temperature range: 4°C – 16°C / 39°F – 61°F
Construction: Seamless (without seams)
Neck: Wide crew neck
Ideal for:
Bike rides during autumn, early winter, or spring
Use as technical underwear under jackets, vests, or long-sleeve jerseys
Cyclists looking for a thermal base layer, lightweight and highly breathable to keep the body dry
Face cool temperatures in total comfort with the Castelli Core Seamless Base Layer. A technical layer designed to accompany you on every ride, offering light warmth, advanced breathability, and maximum comfort under any type of cycling clothing.
