Fit great & look great. Comfortable to wear. When you sleep at night, your muscles will be relaxed, and blood circulation will be easier when you relax. It can promote the oxygen supply of your body organs, and make your body organs younger and more energetic. A light and breathable underpants can make your 'partner' as hard as an iron bar every morning. TIPS: Dear, please allow 1-3cm differences due to manual measurement. We recommend that you could consider a larger size if you think the size maybe smaller. Material: Nylon,Spandex