I work on gas drilling rigs in Pennsylvania. Finding clothing and footwear that can stand up to the harsh conditions on the drilling pad is difficult. I have had a pair for about 6 months now. These boots stand up to the lime, salt, and mineral oil used in various parts of the process. They are completely waterproof without me ever having treated them. I recommend these.

Update 12/22/2013

I am still wearing these boots working in the PA and OH gas drilling rigs. They are mostly water proof (they are just beginning to seep a little water but when the water is 6" deep in my work area all 13 hours). They are still perfectly comfortable. The tread is finally beginning to wear flat under the ball of my feet. I am going to get a couple replacement pairs in the next couple of months.