Polyester is a category of polymers that contain the ester functional group in their main chain. As a specific material, it most commonly refers to a type called polyethylene terephthalate (PET). Polyesters include naturally occurring chemicals, such as in the cutin of plant cuticles, as well as synthetics through step-growth polymerization such as polybutyrate. Natural polyesters and a few synthetic ones are biodegradable, but most synthetic polyesters are not. This material is used very widely in clothing.

FlashDry™ fabric technology is engineered to act like a second skin against the body, pushing moisture to the surface of the fabric and eliminating it as fast as possible, keeping the user dry, cool and comfortable during high aerobic activities.

UPF stands for Ultraviolet Protection Factor. It is the amount of ultraviolet radiation that a fabric blocks.  It is the ratio of the average effective ultraviolet radiation (UVR) irradiance transmitted and calculated through air to the average effective UVR irradiance transmitted and calculated through fabric.