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Castelli Seamless Sleeveless Base Layer

The Castelli Seamless Sleeveless Base Layer is for the minimalist and is best served for the dog days of summer. It represents Castelli's best and latest technology in a summer base garment. Seamless construction provides you with a fit so soft and comfortable, it feels like a natural extension of your body. It was developed and perfected with input from select Team Garmin riders.

The Seamless base uses a two material construction to achieve moisture management with maximum ventilation. The inner layer next to your body is woven polypropylene which rapidly transports moisture away from your skin to keep you dry. This moisture is transferred outward to the outer layer which has an open mesh construction. This layer exposes the moisture it captures for quick evaporation. Being super vented, this outer mesh layer also provides massive amount of venting to keep you cool and helps regulate your body temperature. It's the perfect nexus of fabrics working in in tandem to keep you cool and dry.

This one panel product is anatomically correct to provide you with a tailored-like base layer that fits without sag or bunching of material. One of the best base layers you can purchase and the toast of the peloton.


  • Seamless construction
  • Anatomical patterned fit
  • 2 fabrics working as one approach
  • Super soft, cashmere-like fabric
  • 3 mesh vent sizes for optimal air flow
  • Flat stitch between panels
  • Most used base layer in the Pro peloton


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