Mammut MTR 201 Micro Jacket

Backcountry.com says:
The Mammut Men's MTR 201 Micro Jacket was built for those who seek to cover maximum ground in minimum time when they head to the mountains. The featherlight shell fabric features a long-lasting DWR treatment for tough wind and wet weather protection while the stretchy mesh inserts beneath the arms work to regulate body temperature. Most impressively, the 201 weighs just 3. 5 ounces and packs down small into its own chest pocket so you'll have no excuse to leave home without it.