This should be perfect for outdoor workouts in cool weather. The shirt has a good thickness that should help insulate a bit from the chill in the air and there are thumb holes in the sleeve to help keep it pulled down. The pockets are deep and will fit a phone (you can see in the photo that the phone fits almost entirely), but there's no way to secure the pocket closed, unfortunately. It would be great if there was a velcro or snap closure to help keep things like a phone from bouncing out while on a run. I don't know how much this will block wind, but it should definitely provide warmth in cooler temps, especially if it's during a workout. Worth noting is that this is fairly form-fitting. I got a medium and it fits like it's supposed to, but if you prefer something a little baggier, you may want to size up.