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Castelli Mens Core 2 Tri Short

Men's Core 2 Tri Short

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Dual core performance.

Updated with new fabrics and features, the Core 2 Tri Short from Castelli is your perfect foundational piece of tri apparel. Featuring a highly breathable, lightweight construction, these shorts provide the optimal amount of compression for training runs or short-distance races. Inside, the Core 2's feature a lightweight, non-intrusive liner without padding for running comfort and riding support.

Note: Castelli tops and bottoms are designed with a performance cut that often runs smaller than that of other manufacturers. Consider sizing-up one size to ensure a comfortable fit — e.g., if you normally wear a Medium, select a Large in Castelli. Feel free to contact us with any questions or concerns.


  • Stretch short for run training and short-distance races.
  • Pace 3 Lycra fabric.
  • Lie-flat GIRO3 Elastic.
  • Liner without padding for running comfort.
  • Weight: 97 grams.
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Style Type: Tri Shorts 

Black - Medium

Mfg PartNum: T18113010-3 

Black - Large

Mfg PartNum: T18113010-4 

Black - X-Large

Mfg PartNum: T18113010-5 

Black - 2X-Large

Mfg PartNum: T18113010-6