Nano silver ion material will sterilize automatically when it detect human body temperature Premium quality with seal bag packing Fabrics : 82% Nylon + 18% Spandex Lining : 100% cotton M size for waist approximate  54 cm -  77 cm /  21.26 -  30.31 inch L size for waist approximate 58 cm - 80 cm / 22.83 - 31.49 inch XL size for waist approximate 64 cm - 86 cm / 25.20 - 33.85 inch No bleach， no dry washing， no iron， hand wash only with water below 30 °C Please do not dry in the sun Silky， soft and comfortable Discreet and office-friendly packing in box and no content declaration on courier consignment note to avoid akwardness