Taken from Company Website: Four-way stretch Improved shape retention Ultra flat, second-skin soft feel Highest UV protection (UPF 50+) Ultra chlorine resistant Resistance to sun creams and oils Quick dry & sweat proof Reduced pilling Full liner inside Waistband Drawstring Top-grade thread *Note: there is some sand inside the Speedo that is not visible unless examined close up and I removed the string ties. Only worn once. Price is less than half of listing price because of this.