Pattern Webbing was made from cotton webbing, which was waterproofed and dyed before being woven. Additionally, the station is waterproofed with concrete liners and fully drained. The hull was waterproofed with animal hair, wool, hemp or moss drenched in pine tar. They were not properly waterproofed and would degrade and malfunction when wet. Later suits were made from waterproofed canvas invented by Charles Mackintosh. They are traditionally made of hardened and sometimes waterproofed leather. At the same time the parapet was waterproofed to prevent further water entering the structure. The earliest suits were made of waterproofed canvas invented by Charles Mackintosh. These were made of wool or canvas, and sometimes waterproofed with tar. The hulls of boats and ships were once waterproofed by applying tar or pitch. The bathhouse and other structures were waterproofed in 1943. The best line was waterproofed braided linen. Modern military vehicles typically come from the factory with waterproofed wiring systems. The mail was stored in waterproofed bags to protect it from the snow. The solid sheet form (Palusol) must be waterproofed to ensure long-term passive fire protection (PFP).