User Review: Mountain Hardwear Men's Dome Perignon
The "cone" perignon is built with solid MH structural integrity, no questions there. The fit however is ridiculous. When I first put mine on, it was perfect fit as far as circumference went, but there was enough space at the crown of my head to store a 16 oz nalgene bottle. If it were red, I could put a white puffball on top and wear to Christmas parties.
Unless you have an elongated cranium, like say Indiana Jones' crystal skull, this isn't for you. If you need extra storage space at the crown of your head, you're in luck. Cone, or maybe Spire, but not a dome.