The present invention relates to a tidal-flat boots, comprising: a groove formed by digging into the heel of the boots to a predetermined depth, and an air pipe inserted into the groove and attached to the side of the ankle wearing part, each having a through hole at the top and bottom; It includes; a flip cover coupled to the opening of the groove portion of the heel and opened and closed by pressure fluctuations. According to this, an air pipe is formed from the outside of the boots to the lower heel of the heel, and a flip cover for opening and closing the air pipe is provided, so that the flip cover is opened when the foot is released from the tidal flat, and external air is supplied from the air pipe to the lower heel of the heel. There is an effect that boots do not fall out of the feet and walking becomes easier by dissolving the vacuum state between them.
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