Sugoi Helium Vest
Here's what other sites are saying:
Pack along just in case protection by tucking the Sugoi Womens Helium Vest in your jersey back pocket or fanny pack. Although it weighs in at less than three ounces, the Helium Vest blocks the cold winds at the ridgetop as well as stray showers along your bike or run. Keep the vest on after you clear the cool weather; thanks to the ventilating mesh, youll stay dry and comfortable, and the Scotchlite reflective elements will improve your visibility to passing motorists.