a shoe includes a hollow base fixed in a through - hole formed in the shoe . the hollow base provides a fluid passage for ventilation or drainage . a lid is attached removably to the hollow base to block the fluid passage . in an embodiment , a solid stud is mounted on the shoe adjacent to the hollow base to retain the lid when the lid is removed from the hollow base . the lid may be elongated and has two closure parts attachable removably and respectively to the hollow base and the stud in a bridging manner . preferably , the lid is capable of being press - fitted to the hollow base and / or the solid stud . the lid not only functions to close the hollow base but also serves to hold a logo .