Born of a continuous research and trimmed with a soft and stretchable mesh, DRY-TECH sweatband and rubber Velcro closure, Whi... Born of a continuous research and trimmed with a soft and stretchable mesh, DRY-TECH sweatband and rubber Velcro closure, Whippy is the perfect everyday cap to take during morning jogs or beach walks at dawn. Head circumference: 58cm. Visor constructed with plastic core structure.