Jimmy
Kirkland, WA
Great jacket, but could be even better!
I'm 5'8", 150lbs - normally wear a size S or M t-shirt, but the L size Helius jacket fit me best. Just loose enough to wear a light sweater underneath. Air does come in through the synthetic arm panels, but otherwise it does a good job of keeping out the cold (just wear long sleeves). I wish the velcro straps were zippered/buttoned instead, and I wish there was mesh around the hand openings for ventilation. I also wish the collar had a button closure. The YKK zipper doesn't seem very sturdy - but it hasn't broken on me yet :) In all, a superb-looking jacket that fits well.