1.Polyester 2.INVISIBLE THREE HEIGHTS: The half insoles are invisible design. Nobody would know the secret of your increased height. Three optional heights are perfect for different occasions like meeting, appointment, wedding, shopping or any events where there is a camera lurking about. 3.DOUBLE LAYER STRUCTURE: The High-density PU insoles with high-elastic GEL layer and honeycomb design are crafted to fully absorb shock and reduce stress on feet with every step. More lightweight and durable which providing enough support to your heel. 4.ALL DAY COMFORT: The odor free mesh fabric can highly wick away moisture and keep your feet fresh and dry all day long. The honeycomb bottom with stickiness prevents insoles slipping inside your shoes. The U shape heel cup helps maintain stability and position the heel naturally to make your heel more comfortable. SPORTS, WORK & LEISURE: The heel cushion inserts are perfect for improving performance and reducing fatigue in daily life. Good cushioning effect can reduce impact on the joints and muscles, relieving pains caused by leg length discrepancies, heel spurs, achilles tendinitis.