I have only worn it once but I was happy with the top. The quality of the product and the material are completely acceptable (especially at this price). I wore it for an early morning run and with a chill in the air to begin with, to brilliant sunshine by the end - the top did indeed control my temperature (not sure how this works) much better then a normal t-shirt I had been wearing previously. It's got flat seams and according to the info SPF. To my mind, the only issue that potental purchasers need to consider carefully is which size to go for. It is a compression top and so sure it is a tight fit -and I mean tight, it leaves absolutely nothing to the imagination! Being a size 8 women, I normally fit into 9/10 year old boys clothes. On getting the boys size I wasn't sure if I would get in it let alone for it to fit (it looked the right size for my small dog!) but I gave it a go thinking that I would be sending it back but it did fit (just) as it is quite strechy.