Material: Made of durable and comfortable silica gel, washable and reusable Universal Design: These come in a pair of 2, for left and right footand in 4 different options - 1 Layer : 0.8" 2 Layers : 1.4 3 Layers: 2" 4 Layers : 2.6" - to let you choose your desired number of layersand height!! The insoles can fit equally well in both men's andwomen's footwear and can be easily removed when you do notwant to use them Invisible Four Heights:The half insole is an invisible design. No onewill know the secret of your growing height. The four availableheights are perfect for different occasions such as meetings,appointments, weddings, or any event with a cameralurking around All-day Comfort: The odour-free velvet fabric is highly moisture-wicking, keeping your feet fresh and dry all day. The stickyhoneycomb bottom prevents the insole from sliding around insidethe shoe Application: Suitable for various shoes such as high-heels, leather shoes, flats, pumps, boots, etc. One size fits most adults, whether it's men or women