This is some really good durable stuff.

Product is of good quality

I would highly recommend buying this product when doing a "dry lock". I would buy again!!

We just installed he product so we can't make any claims as to its effectiveness, durability or longevity. The major drawback to this felt is how slippery the vapor barrier is over the felt. The plastic and the installer glide over the felt like melting ice making it a nightmare to work with. The unexpected sliding tendency caused me to slip and fall a couple of times trying to stand from kneeling to walk across it. There is still a lot for me to do under the house and the slippery environment is going to make the rest of my work even harder. If I had realized the felt would end up being a drawback, I would not have completely removed the old vapor barrier all at once. I now am fighting the clock and increased humidity levels in the crawlspace. If I knew the felt and plastic together would make installation so frustrating, I wouldn't have bought the felt.

The underlayment-42, worked well and seems very durable! I am now using my CrawlSpace for a storage space.