I've worn this shirt multiple times already this abnormally hot Spring. It feels cooler on my skin than my usual tech t-shirts (P*tagonia and Arcter*x). I haven't worn the James Peak in humid weather, so I can't offer my experience there.

Pros:

--cool

--more cooling options than t-shirts (unbutton the shirt)

--can double as business casual wear WITHOUT ironing

--excellent construction

Cons

--cost

--buttons

This shirt is better than almost any other top I own for keeping my dry and cool. I've worn it three times in the last two weeks (washed between wears) since mid-April weather here has been abnormally hot (90° on two days, mid to upper 80°s the rest of the time). No sweat (I am heat acclimated, though) and phenomenal breathability. I look forward to wearing this shirt when it gets more humid.

Pros

1) Well constructed

2) Stylish — can wear for business casual or running

3) True to size — athletic fit

4) Cool and breathable

5) It does not need ironing

Cons

1) It is a little pricey