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Castelli Pro Seamless 2 Arm Warmer
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Pro Seamless 2 Arm Warmer

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A Better Arm Warmer

Castelli saw room for improvement in typical warmers on the market, so they set out to make an arm warmer unlike any other. The Pro Seamless 2 Arm Warmer suits a wide temperature range for comfort on any ride.

Typical warmers on the market are made with a nylon and Lycra® blend that tends to hold moisture, but Castelli knew they could get better moisture management with polyester yarn. Working with polyester makes it more difficult to get the right stretch, return, and manufacturing consistency, but in the end, it's all worth it. This mid-weight warmer is great even when not worn since they fold up so small, and the fully seamless construction eliminates itching and chafing.

The Pro Seamless 2 warmers are a pro rider favorite because they're crazy light and they're extremely warm for their weight, yet even in milder conditions, you don't overheat.


  • Mid-weight seamless arm warmer
  • Surprisingly warm without causing overheating
  • Unique polyester/nylon/Lycra® blend
  • Fully seamless construction
  • Folds up extra small

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.


Primary Color: Black 

Black - S/M

Mfg PartNum: P4521541010-2 

Black - L/XL

Mfg PartNum: P4521541010-4