Wind Shell
A wind shell has one main purpose: to keep the wind and rain off in active outdoor pursuits. The majority of wind shells are very lightweight (in the 5-ounce range), and some can get as light as 3 ounces. They are usually merely wind-resistant and water-resistant, but those small performance sacrifices lead to better breathability, enabling the fabric to transport sweat vapor away from the body better than a fully windproof or waterproof fabric. This can be very welcome in high-octane activities.
