Scott Jasperwrote a review of Outdoor Research Helium Pant - Men's on October 20, 2016
Familiarity: I've used it several times
Fit: True to size
I've been putting off getting proper rain pants for years. Last year, a Wind River Range adventure ended in several days of 32 deg rain and snow... effectively moving the rain pant issue front and center!
On a recent trip to Colorado's Weminuche and Rawah Wilderness areas, I used my Helium pants every day. On the first two days we dealt with rain, snow and SLOPPY trails. The waterproof Pertex Shield+ fabric was indeed waterproof. On clear nights, temps dipped into the 20's and the Heliums held back cold winds around camp.
I usually wear 34" waist with 32 to 33" inseam. My size large Helium pants fit me perfectly.
These pants have ankle zips. I wear size 11 La Spotiva Trango TRK boots and taking pants on/off over boots requires a little patience and persistence. No star deduction for the short zips because they help achieve a crazy low weight (5.9 oz on my scale).