I believe that the flip sleeves will be ideal for Fall to Winter runs as it gets cold. Can use the sleeve to potentially wipe sweat off the head or face. During the summer time, the sleeves are a bit too thick and uncomfortable. The first 10 minutes I definitely felt warm. But after that I got use to the feeling of having it on.
I did really enjoy having the slot for the watch as I was able to review my time periodically. It did not move as I was running.
Overall, the flip sleeves were solid and comfortable, but would not recommend wearing it in warmer temperatures.