This is a nice light fabric, wicks well.  The watermellon color is a bright pink, perfect for the breast cancer walk.  My only concern is that the sleeve holes are kind of  close under the arms.  We'll see if that rubs on a longer walk.  I like the overall modest style and longer length so my tummy doesn't peak out during workouts.  If I don't have any problems with the armholes, I may buy another.

UPDATE:  I used this top for long training walks and eventually walked 20 miles in it for the Three Day.  It was wonderful, no chaffing or hot spots, stayed cool and comfortable the whole day.