Thank you for viewing! Vision Peaks Water Shoes These shoes are made of mesh material, which provides excellent breathability, making them perfect for marine sports. They can be used as marine shoes for pools, the sea, clamming, playing in rivers, etc., and can easily provide safety measures by wearing them for both land and water activities. I purchased them last year and used them twice. Size: 21cm They have been washed before listing. There is sand that could not be completely removed from the grooves on the soles. Please understand this before purchasing. I plan to ship them by lightly compressing them during packaging. Thank you. Himalaya Vision Peaks Marine Shoes Water Shoes