3.5cm white. Recommended for those who want to increase their height without anyone noticing ☆ 【Secretly increase height, and gain confidence】 Secret insole with two ways to wear it! You can use the insole by putting it in your shoes, or you can put it in the socks you are wearing. It's okay even if you suddenly have to take off your shoes! Just put it in the socks you always wear to increase your height. 【Comfortable to wear & non-slip】 The secret insole uses medical-grade silicone material, so it has excellent flexibility and elasticity, making it comfortable to wear, and comfortable even for long periods of wear. And, it adopts a honeycomb structure, which has excellent anti-slip effect and absorbs impact. 【Washable】 The secret insole can be washed with water and used repeatedly. It also has excellent antibacterial and deodorizing properties, so you can use it hygienically. 【Ergonomic design・Heel protection】 Height insole designed according to ergonomic design. It fits perfectly to the shape of your foot and is gentle on your soles. In addition to increasing height, it can relieve pain from plantar fasciitis, heel spurs, and blisters as a heel protection cover. 【Fits any shoes】 It is an insole that can be used in various shoes such as boots, sneakers, hiking shoes, and shoes for standing work. It can be used regardless of gender or age. The insole is marked with R and L.