Polypropylene vs polyester base layer reddit The newer stuff seems to do better but it can hold odor even after a wash especially if it was left to ferment in a laundry basket or backpack for a few days, then the odor comes back with a vengeance with a little heat and sweat. Polypropylene Webbing: Affordability: Polypropylene webbing is often more affordable than nylon or polyester. Polyester. It could be that a mesh base layer is as warm as a regular base layer, just lighter. I wear normal boxer briefs during the daytime hiking and then switch into my base layers as it gets cold, but that’s just my personal preference. The polyester base layers are nice but very stinky and difficult to wash out the odor. I never mentioned nylon at all. Personally I found that merino, once wet, stays wet and that made me cold! Synthetic base layers dry quick and are better at moisture transfer. If the high is below 40 i wear the 250 layer. But that fall created a decent tear in my rain pants, base layer and skin layer. qdxkjizradtqwdulacujgglawepkugkecaifmslipbobpsggswbnhrwwzyyckeofirgrlakwu