Qikafan Women's Menstrual Period Leakproof Panty 95% Bamboo fiber & 5% Spandex Material:95% Bamboo fiber & 5% Spandex,Water-Resistant Lining 82.2% Viscose, 17.8% Cotton.The lining adopts regenerated cellulose fibre, it achieves moisture permeability , resistance to water and good antibacterial property. Tips:the role of the pocket:the pocket is used to install warm paste,something used to relieve abdominal pain during menstruation. Extra leak proof coverage to provide maximum protection front and back, guarding any unexpected leakage.Inner leak-proof lining, broaden and longer, greatly prevent side leakage, excellent for days with menstrual cycle heavy flow, post partum bleeding or urinary incontinence,and offers mild tummy control effect also. It serves as extra protection from leaks. You need to add the pad/tampon. The underwear protects you if there is an overflow from the pad/tampon. There are four models,and each model corresponds to a different waist size:NK9822 suitable for waist measurement:23.6''-31.5'' Low-waist NK9823 suitable for waist measurement:24.9''-31.5'' Low-waist NK9824 suitable for waist measurement:30.1''-36.7'' high-waist NK9826 suitable for waist measurement:32.8"-36.8" high-waist