Polyester, on the other hand, is water-resistant. Polyester is also referred to as "everyday waterproof," which indicates that, while it is not entirely waterproof, it is sufficiently protective for most daily scenarios, such as being out in the rain or snow, but not completely buried under water for an extended amount of time. Like cotton, polyester becomes less resistant to moisture as it gets wet and dry. There are several factors that determine how water-resistant a particular polyester item will be. The number one factor is the type of fiber used to make the item. For example, if the item is made from 100 percent polyester poplin, it will be more water-resistant than if it were made from 100 percent rayon. Poplin is a heavier fabric with more texture than rayon, so it tends to hold water better. Next, consider the material used to attach the fibers together. If the item is made up of many individual threads rather than a single woven thread, it will be more water-resistant than something with many loops or strands, such as cotton. Last, consider the method used to finish the item. If the item has been brushed or padded with water-resistant materials, it will be more water-resistant than one that has not been treated with these materials.