The Autumn Butte 3L Bib Pant builds its shell from two 3L fabrics, a heavy-duty 150D polyester weave and a lighter 90D ripstop nylon, giving the pant both durability and packable weight in one build. Full seam taping backs a 20K waterproof and 20K breathability rating, so a wet, wind-driven storm day stays outside the bib while body heat still escapes through it. The bib format and adjustable waist keep snow out at the top, while YKK zippers reinforce every closure on the pant. What Our Gearhead(R) Experts Are Saying:"I unzip the thigh vents on the skin track and stop sweating through my base layer within a few strides. The mesh lining dumps heat before it builds up, and the shell still keeps the storm outside where it belongs."