I have been a big believer in patagonia until I ordered this shirt. I had been so impressed with them that I ordered two for me and my son. This shirt does not hold up. After a couple of hikes I already have five holes in it from where the material frayed and broke. These shirts do not meet the previous standards I have had for patagonia. All of my previous patagonia shirts have been great. I have icebreaker base layers that have lasted a few years of wearing on tough hikes with no holes, no fraying, no wear marks. BUT couple hikes with this one and it looks like rats have been gnawing on it in spots.