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The one glaring drawback of a baseball cap is the fact that the brim, being only at the front, doesn't provide a whole lot of protection from the sun. There are workarounds, of course - like wearing the cap at different angles to ward of the sun. You can also use sunblock cream. Neither of these is perfect and walking in hot sun can be a bit of a bastard for cap wearers.
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I've been using a CapHat over the past couple of months. At only 60 grams it's no big deal to carry it (I am no gram weeny). It squashes up very small so I stowed it in the top pocket of my pack, getting out when the days got hot.
The CapHat sits on top of your baseball cap. A toggle at the back lets you tighten it around your head. The hat wraps around your head, with an open section at the front, Legionnaire style.
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It's easy to put it on or remove it, to suit the weather conditions change - a big plus point if, like me, you live near the ever-changeable Melbourne.
I've so far been pretty impressed with the CapHap and I'm recommending for anyone who walks in a baseball cap.
If you want to get your hands on one of these, check out the CapHat website. They're also on facebook. Price is $20.
Note: CapHat provided me with a CapHat for this review. I don't think they want it back, so I will probably just keep it - it will be handy over the coming Australian summer. (If they do want payment, well, hey - it's only 20 bucks and this is a pretty handy garment!)