for females it is a little too big, but when used with a silicon cap over the top it really holds the heat.

Identical to Blueseventy Skull Cap  which I also bought.
Lack of adjustable neckstrap makes it cheap to produce but result is inferior comfort.

I used this recently swimming in Lake Michigan near Traverse City. Water temps have been unusually cold this year. The neoprene cap made a difference, keeping my head warm and comfy even in high 60's water.
I wonder about its durability, but time will tell on that.

Comfy and warm, what more could you ask?

too tight....

it does get a little hot around the ears, but the main thng is that it STAYS ON AND IN PLACE--no more adjusti ng of swim cap!