Helly Hansen caught our attention with a claimed 2.1 oz windshirt (1.9 oz for the women's version). The jacket has a full zip and no hood. The men's version is called the Mars; the women's the Venus. Our sample weighs 2.5 oz in size large, just barely lighter than the MontBell U.L. Wind Jacket (2.6 oz BPL verified for size large) which is also a full-zip, hooded jacket. Still, as far as we know, Helly's claim holds up, although barely.
The pits have tiny holes punched through the fabric, presumably for ventilation. I can't help but wonder about durability.
Features and Specifications
Weight claim: men's medium 2.1 oz, women's medium 1.9 oz
Nylon with DWR finsih
Full front zip
AirCon lazer cut underarm venting
"Helly Hansen Mars and Venus Windshirts (Outdoor Retailer Summer Market 2005)," by Carol Crooker. BackpackingLight.com (ISSN 1537-0364). http://backpackinglight.com/cgi-bin/backpackinglight/helly_hansen_mars_venus_windshirt_orsm05.html, 2005-08-14 03:00:00-06.