http://www.ebay.com/itm/401061221390
This vintage derby is S.B.A.’s Comfort hat, with a Bon Ton Ivy self adjusting sweatband and positive ventilation which supposedly prevents balding. It measures 20-3/4″ in circumference.
http://www.ebay.com/itm/400986554100
This vintage boater was made in the 1930s and was sold by the J.C. Penney Company under the Solar Straws / Sol-Air Conditioned label. It is an open weave, and has a Bon Ton Ivy ventilated floating sweatband. The hat has a distinctive hatband design, and is a 7-3/8.
Vintage-Haberdashers Blog 