Originally Posted by J.Schaef

This is just copied and pasted off Sierratradingpost.

Examples of Waterproof/Breathability Ratings for Major Manufacturers

Columbia Sportswear Omni-Tech® (Adults) 10,000/10,000
Columbia Sportswear Omni-Tech® (Kids) 5,000/5,000
Event Event 30,000/22,000
Gore-Tex® PacLite® 28,000/15,000
Gore-Tex® Pro-Shell 2-Layer 28,000/25,000
Gore-Tex® Pro-Shell 3-Layer 28,000/25,000
Lowe Alpine Triplepoint® 3-Layer 20,000/20,000
Marmot MemBrain® 20,000/25,000
Marmot PreCip® 15,000/12,000
Marmot PreCip Plus® 25,000/15,000
Mountain Hardwear Conduit 20,000/20,000
Sierra Designs Hurricane 8,000/2,000
Sierra Designs Microlight 600 N/A