The invisible feet pad is self adhesive. It will protect your feet from the hot sand. and you can walk freely on the beach like barefoot feeling. <br><br> Material: Nano Environmental-friendly Glue Stretch Textile +Environmental-Friendly Anti-Slip Silicon Dot <br> S: Length 21.5cm/8.5 inch <br> M: Length 23cm /9.05 inch<br> L: Length 24.5cm/9.6 inch<br> XL: Length 26cm/10.2 inch<br><br> Package Includes: 3 pairs * feet pads ( 1 pair each of Black, Red and Blue) <br>