Yup... Lived in Austin for many years before Houston,,, Not near as muggy as Houston,,,

Evap vests are better suited to drier regions,,,, They are pretty much just a hot wet blanket here,,,

Looking at phase change or 'ice pack' vests,,, Wifey refuses to ride w/o her full face and armored mesh jacket,,, She's just about ready to pass out now and Summers not fully here yet,,,

Even sans-jacket with a 3/4, I'm plenty darn warm!!!

If an ice vest could allow me and mine to ride 'comfortably' for a few added hours, with armored jackets It seems we'd be foolish to not have 'em,,,

Phase change 'sounds' nice, but not really sure it has enough cooling power to do the trick. (I enjoy ~cold~, not really looking for 'a little less heat' on a 100 degree mug-nasty day,,,)