I may have come across a defective pair, but the first time I wore them the sole started to separate from the shoe. I bought these for a fall trip to BWCAW with the idea that in 35 degree weather they could get wet and dry quickly. There they were not disappointed. But on the first day, after taking just two short puffs, they began to disperse. I bought these because I didn't want to spend $80-$100 on vapor gloves, but I think you get what you pay for.