The Patagonia Terravia Peak Tights reinforce the front legs, seat, and rear waistband with a woven panel built specifically to resist abrasion from a loaded pack, while a double-knit jersey body keeps the rest of the tights soft and stretchy. That hybrid knit and woven construction moves as one piece rather than fighting itself at the seams, and a gusseted crotch adds mobility for long days of scrambling and hiking. Flat-seam construction keeps the whole thing chafe-free from the first mile to the last. What Our Gearhead(R) Experts Are Saying:"I carried a loaded pack for a full day on rock and dirt, and the rear waistband panel showed nothing for it, no wear, no thinning, right where a pack strap usually finds a weak spot."