To provide boots capable of ensuring a stable step on a sharp slope.

Front and rear parts of an ankle part of the boots have a bellows structure (a), to provide freedom of an ankle in order to ensure force for staying even in both conditions of an uphill and a downhill slope, a belt (b) is fixed by a fixing device (e) part to fix an instep part and a heel part in order to prevent slip of a foot in the boot, and a spike capable of biting into a ground contact face on a slippery face and being stored as required is attached to a bottom face to prevent slip even under any situation and contribute to the prevention of disaster.