Spot on.
Just got back to the Maldeves (constant 28-30 degrees, winds speeds between 0-10mph) where I tested this and other sun/hot weather shirts. This one (in black) came out top. Not only was it the coolest but it was the most comfortable by a long shot. It seemed brathable and felt light weight. With an spf50 rating it gave excelent sun protection and as a bonus, it protected against mosquito bites. Being nylon it was not affected by the 100% deet spray that I used on occasion. The brushed effect nylon does give it the appearance and feel of light weight cotton. The consealed pockets make it very practical but give it a clean, semi formal, non safari look. All the buttons work well. Top shirt, from now on, when expecting hot weather this will be the only shirt I need.