I have one of these in green and one in blue which I've had for a couple of years. They are simply the best running top for the money. The pocket is large enough to hold a smartphone - I have a Sony Xperia which is larger than an i-phone. The loops for thumbs are handy. It's warm, but doesn't make you clammy. It has a zip at the neck so if it gets slightly warm you can unzip. It's a snug fit, so don't go for this if you like something looser, but I find it really comfortable and warm. It's brilliant for winter runs.