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Castelli Men's Aero Race 5.1 Jersey

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Backorder: This item is currently out of stock but is available to purchase today as a backorder. The expected availability date shown above is our best estimate as to when it will be shipped to you, but this date is subject to change based on our receipt of this item from its vendor. Shipping in the continental US is free for all backorder items (for international orders, our customer service team will contact you when the item is available to ship). We can not accept Paypal for backorder items (credit card checkout, only). Your credit card will not be charged until your item ships. Anytime prior to shipment, your backorder can be cancelled by contacting our customer service team.

The newest in Castelli's line of revolutionary aerodynamic jerseys, the Aero Race 5.1 saves 2 watts and sheds 40 grams over its predecessor. The new and improved Velocity fabric makes up the front of the jersey, using a featherlight blend of fibers that channel air over your shoulders across its dimpled surface. The sleeves and back continue the dimpling with the 3D mesh fabric, wicking moisture from your skin and keeping you cool through the hardest efforts. Not only is this jersey incredibly fast, it's incredibly lightweight at just 103 grams.

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.


  • Aero fit and fabrics deliver 22 watts of savings at 40 kilometers per hour.
  • Velocity dimpled front panel.
  • 3D Mesh on back for optimal ventilation.
  • Mesh arm bands.
  • Compression band around waist provides structure for 3 rear pockets.
  • Silicone gripper elastic.
  • Full-length YKK® Camlock zipper.
  • Claimed weight: 103 grams.

Sleeve Type: Short Sleeve 

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*Orders received before 3:00PM Pacific time are shipped the same day (Mon-Sat). Orders over $50 are shipped free (USA only, excluding AK and HI). Some exceptions apply. See Shipping for details.