Offering a lighter weight and anatomic shape, the Nano Arm Warmers from Castelli feature windblocking Stratosheer panels up front and breathable, flexible PowerLycra on the back joined by comfortable flatlock stitching. Silcone grippers on both the inside and outside help to keep the warmer in place and prevents clothing from riding up.
Use the table below to find the right fit. The measurements listed are for the unstretched GARMENT. Your upper arm will be 1-2 inches LARGER.
| Size | Length | Wrist | Upper Arm |
| S | 17" | 6" | 9.5" |
| M | 18" | 6" | 10" |
| L | 18.5" | 6.5" | 11" |
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