The Giro Wind Vest is your all season go to for immediate deployment to respond to changing weather conditions. Sometimes, winter just requires a warm sweater however, once the wind picks up and the precipitation comes down, things can go south quickly. Even in spring or fall a long descent can leave you with a chill for the rest of the ride, and summer rain is no fun when you're soaked on the bike. The Wind Vest's wind and water resistances mean that it's useful for inclement conditions year round. It's also moisture wicking and has mesh vents in the back, so it won't turn you into a moving sauna during summer showers or impede the breathability of your insulating layers in winter. When the danger has passed, the Wind Vest compacts down enough to fit into a pocket or saddle bag, ready to deploy at the next sign of inclement conditions. It's also got reflective piping to help keep you visible when the clouds do roll back over the sun.