- No Show Invisible: Easy to match different kinds of shoes, such as sneakers, oxford, running shoes, casual shoes, training shoes, athletic sports shoes, and business shoes., not for very low cut shoes.
- Four Size: S: US Women Size 5-8.5, Men Size 3-4 / M: US Women Size 9-12, Men Size 5-7 / L: US Women Size 12-14, Men Size 7-9/ XL: US Women Size 14-1
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