Wore this on a humid 90-degree round and the perforated panels actually kept me from overheating. The zippered chest pocket fits my phone without bouncing, and the sunglass loop is one of those small things I didn't know I needed.
The zippered chest pocket is handy and the fabric does breathe well, but the fit runs boxier than expected through the waist. The sunglass loop is a nice touch, though I wish the collar held its shape after a wash.