Works well and kept the burn away all day at Lake Havasu and while gardening in summer in Las Vegas.  Great product and seems durable though I've only worn each shirt once.  The only down side is the XL size was really large.  I had to wear a short sleeve t-shirt over it to keep it in place.  I've been wearing XL printed t-shirts for a long time and they typically fit me fine but I was swimming in this one.  I did love the shirts though and the price was great so I've ordered them again in Large and am hoping for a better fit.