yeah 2,000mm isnt water proof. thats water resistant. A good water proof breathable coat or pant will be at around 10,000mm for waterproofing and around the same for breathability. if you have a pant that is like 15,000mm waterproof and only 2000mm breathable your still going to get wet. and i thing that the mm rating is the amount of pressure it takes for water to soak through the product.
oh yeah, and to be officially waterproof the pants/jacket have to have taped seams. But then again, just because something has taped seams doesnt mean the fabric itself is h2o proof. and just make sure that whatever you get that its actually breathable because if its not you will own a one man suana.
2,000mm is NOT how much area of your jacket is waterproofed! 2,000mm is actually a rating they use after they test a section of material using a water column test. They keep adding water until some leaks through the material, and 2,000 is the amount of water that the material can handle, so yes, a jacket thats 15000mm IS much better. I think the mm is millimeters, so the water column would be 2000mms tall by the time the water leaks through. is this making sense?
'You two are the blackest white chicks I have ever met.' ~Danny M
^ Yeah, she has it right. The other thing to consider is how the seam-sealing. Some companies put a half-decent laminate in for the watercolumn measure, but cheap out on the seam sealing. The fabric is waterproofed before the garment is put together, so once it is there are thousands of needle holes where it was stiched. Look for 100% of seams being sealed, not just major seams. You can ususally tell by turning it inside out and looking around at it. Good waterproofing + no seam seal = you standing around in the rain wearing cheeze cloth.