They are sewn with a deliberate twist in the fabric, a Möbius design.
The iRun UV Polyester Headband. Can be worn with the twist on the top or the bottom. They are wide enough to cover your head, and still able to scrunch or fold the fabric to make it thinner. Specifically designed with wicking knit polyester that blocks more than 98% of the sun’s UVA and UVB rays. Bring on the sun and the sweat! Very Soft! UPF50+
Super comfy! And Super Awesome! You’re welcome!
iRun UV Polyester Headband - One size fits most
Material: 89% Micropolyester, 11% Spandex
Washing: Machine wash cold, mild detergent, lay flat to dry