Bottoms are an apparel term used to describe the layers of clothing worn on the bottom half of the body. Bottoms may be in reference to undergarments or outerwear.
About Polyester:
Polyester is a synthetic material used for making fibers. Polyester has many industrial applications but is most commonly known to be employed in the textile industry as a durable garment fabric due to its strength, resilience, and quick-drying and wrinkle-resistant properties.