Using the same expertise you’ve come to appreciate and trust from Stego Industries’ Stego Wrap below-slab vapor barrier, 15 Mil Stego crawl space vapor barrier Wrap is a white liner with a custom blend for excellent outcomes in crawl space conditions. This technologically progressive multi-layer plastic extrusion vapor barrier provides unrivaled moisture protection and durability in the most unforgiving conditions (rendering reinforcing string useless!).