the second version of the IBTLongsleeve has been adjusted for a more contemporary fit that allows for easier layering and more airflow.
engineered for cold-weather performance.
built with COOLmatic | EXP DIAMAfleece lite™, a lightweight fabric we developed with a Japanese mill, this long sleeve features a smooth outer surface and a soft brushed diamond grid on the inside for comfort.
embedded with carbon yarn, it enhances temperature regulation and odor control, making it the idea item to layer with our HLSTShirt for chilly runs or a standalone piece on milder days.
a bonus, this product can be flipped inside out midway through a run, giving you less loft and accelerated breathability to shed excess heat.
lightweight, breathable, and versatile, this piece is designed to keep you moving through the cold even as you heat up.
- recycled polyester and carbon COOLmatic | EXP DIAMAfleece™
- comfortable mockneck
- thumb holes
- reflective detailing for night run visibility
- weight 250 grams
- machine washable
Please read our full return policy here.
We accept returns on items that are in like-new condition within 15 days of original purchase.
Items on sale are final sale and are not eligible for returns or exchanges.
The following items are final sales:
We do not accept international returns
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