The biggest selling feature is the detchable magnetic sleeves. (The sleeves snap into place and you feel kind of like a transformer.) The sleeves are incredibly easy to take off and put back on while running with a rear pocket to store the sleeves while running with the just the vest on. The Versa is great for chilly weather – you start out with the sleeves on and as you warm up you can take the sleeves off. It’s also water-resistant so the Versa is great for wet weather as well.