Elastic closureSIZE TIPS: Due to the SMALL elasticity, please choose a BIGGER size if you prefer the comfort type. Please check our Size Chart carefully before purchasing.MATERIAL: PBT fabric imported from Italy, high quality. High-energy anti-chlorine technology, resisting the stimulation and injury of chlorine gas in swimming pool, protecting your skin.STYLE: Classic triangle and mid waist design to show your muscle. 3 Colors and 10 sizes in choice, suitable for most of people.GOOD FIT: Rubber bands at edges for a good fit no matter the activity, helping you move with freedom and confidence. Elastic waistband and invisible drawstring to make the briefs more comfortable and suitable.EXCELLENT VALUE: More perfect for competitive athlete. Its elasticity is not affected by humidity, wrapping your body well and producing little resistance. You can swim faster with this briefs.