Spent $40 on a vented brolli a while back but it is too big for just walking around with. Hard to find one that is vented portable, fiberglass and good if your walking in the sun as well as rain.
This is a great idea and real kiwi innovation. Good job!
I don't look good on the future of these kind of umbrellas. It's like the case of typewriters and improving on typewriters, which is slowly dying off when PC came out. Just use raincoats when it's raining.