Material: EVA Invisible height increase and instant taller Shock absorbent, reduces muscular aches and pains Compatible with both sport and regular shoes Stainless steel is the abbreviation of immortal acid-resistant steel, which has high mechanical strength and corrosion resistance, and strong gloss. Features: Use high quality ventilate fabric, nonpoisonous and harmless Stoma design allows better air circulation inside your shoes Full-size insoles provide better support and make your feet more comfortable Help reduce pain and increase comfort when walking and standing Easily Trimmable by Cutting To Your Exact Size