ONS Core Light Neck

From Trimtex:

"With this neck you have a lot of possible ways to use it, which makes it both great and versatile. Wear it while skiing, running, walking or on your spare time. It can be used as both a neck, a hat, and a headband, depending on your needs. The neck's medium thick material is breathing, elastic, and quick-drying. 
This neck has a regular fit, which means that it should sit loosely and in no way feel restrictive."