The item is made of memory sponge and PU. Arch support insoles improve balance and relieve arch pain for all day comfort. Besides, it can help reduce stress and strain on the ankle, knee and lower back. It is for all kinds of shoes, hiking shoes and working shoes. Features - Color: Yellow Grey. - Material: sponge, PU. - Size: L, US Size 8-12, 31cm. - Thickness: 10mm. - Memory insoles re-bounce in 2 seconds. Best for walking insoles and long standing insoles. - Arch support insoles improve balance and relieve arch pain for all day comfort. - Additional heel cushion protects heel spur from most painful shocks High resilient blue gel cushion provide extra protection Stoma design. - Don't be afraid of sweat, suitable for sports, and keep your feet smell in fresh. - Improve step balance and foot strength. - Anti-skidding, shock-absorbing and depressurizing. - Reduce the damage to the foot due to vibration. - Applicable for all kinds of shoes, hiking shoes and working shoes. - Can help reduce stress and strain on the ankle, knee and lower back.