Invisible height increase, elegant upgrade. The base height is 3 cm and can optionally be increased to 9 cm. It naturally improves your posture through the \"heel lift effect\", which straightens your body and strengthens your self-confidence. The all-black velvet surface is discreet and elegant, suitable for business leather shoes, casual shoes and boots; invisible and discreet. Scientific four-layer structure, comfort in all weather conditions. Multi-layered composite design: breathable surface layer + shock-absorbing air cushion + arch support + non-slip underlayer, distributes foot pressure so you don't feel tired, even when standing for a long time. Pressure-relieving air cushion in the heel: effectively absorbs shocks and ensures your foot remains relaxed, even during long walks. Suitable for various types of shoes. You can easily cut it to the correct size (by marking the measurement lines), and it is suitable for men's and women's shoes in sizes 35-44. Sneakers, leather shoes, ankle boots and similar can also be easily fitted. The 270 mm longer design keeps loose shoes firmly in place so they don't move. Breathable and antibacterial, keeps you dry. Ventilation holes in the forefoot promote air circulation and prevent stuffiness and unpleasant odors. Easy to clean material. Wipe it every day to keep it hygienic. Suitable for daily use. Multifunctional use in scene. It can invisibly increase your height and improve your appearance at work, in social situations, during dating and on other occasions; it can relieve foot fatigue during commuting or prolonged standing and combines functionality with fashion.