Canadian Ciele Athletics makes fantastic running caps. Just make sure you get the right size.
Size chart Ciele Athletics
You measure your head circumference and that corresponds to the size of the cap.
ALZCap
The ALZCap is a slightly smaller model. This comes in a standard size of 56.5 centimeters, but is adjustable. This Cap with a head size of 56.5 CM fits a head circumference of 53.5 CM to 59.5 CM.
GOCap
The GOCap is the standard model that Ciele once started with. This comes in a standard size of 58 centimeters, but is slightly more adjustable. This cap with a head size of 58 CM fits a head circumference of 55 CM up to 63 CM.
