I originally received one of these shirts when participating in a marathon.  I love that shirt, fits nicely, a bit loosely perfect for working out in.  This shirt is very nice, but it runs about half a size small.  I can still get it on but it's a little snug for working out in.  I expected the fit to be the same since they came from the same company.  I'm disappointed because I really like the original and was looking forward to having more of them.