Castelli Insider Jersey review

Is riding inside unique enough that there’s room for an indoor-specific jersey?

Castelli Insider Jersey
(Image: © Josh Ross)

Cyclingnews Verdict

By remixing existing Castelli technologies, the Insider jersey manages to keep pricing lower and does a good job addressing the needs of indoor cycling but the design team should revisit the waist


  • +

    Plastic zipper will not corrode

  • +

    Lower price makes it easier to replace often

  • +

    3D mesh does a good job of balancing breathability with coverage

  • +

    Double rear pockets address the needs of indoor cycling


  • -

    Waist either rides up or folds over

  • -

    Zipper bulges at the bottom

You can trust Cyclingnews Our experts spend countless hours testing cycling tech and will always share honest, unbiased advice to help you choose. Find out more about how we test.

Indoor cycling is unique in the challenges presented on the bike and it’s unique in the equipment needs. Like any cycling, you could grab whatever jersey you've already got and manage - you could even go sans jersey but there are companies that understand the unique needs and have risen to the challenge with specialty products. We've put together a list of the best indoor cycling clothing as a way to help offer some guidance. 

One of the brands that's well represented on that list is Castelli. While some brands have chosen to repurpose and rebrand outdoor gear, Castelli has gone beyond. The Castelli Insider jersey does leverage existing Castelli technologies but it's unique compared to the outdoor gear. Did Castelli hit the mark with its indoor-specific design? 

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Josh Ross

Josh hails from the Pacific Northwest of the United States but would prefer riding through the desert than the rain. He will happily talk for hours about the minutiae of cycling tech but also has an understanding that most people just want things to work. He is a road cyclist at heart and doesn't care much if those roads are paved, dirt, or digital. Although he rarely races, if you ask him to ride from sunrise to sunset the answer will be yes. Height: 5'9" Weight: 140 lb. Rides: Salsa Warbird, Cannondale CAAD9, Enve Melee, Look 795 Blade RS, Priority Continuum Onyx