OSHA standard 1910.136 - Occupational foot protection. is the standard that governs safety footwear in regards construction. Specifically:
1910.136(a)

General requirements. The employer shall ensure that each affected employee uses protective footwear when working in areas where there is a danger of foot injuries due to falling or rolling objects, or objects piercing the sole, and where such employee’s feet are exposed to electrical hazards.

It gets a bit confusing since the standards have been changed from ANSI Z41-1991 to ASTM F2413-05. You can read about the ASTM requirements here.

THOROGOOD RAIDER BLK MEN’S 6" SAFETY TOE BOOTS 8M NIB

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NEW MENS COFRA WORK THINSULATE SAFETY BOOTS SHOE 8.5

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COFRA STEEL TOE WORK SAFETY LONG BOOTS SHOE SIZE 8.5

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NEW MENS MICHELIN SAFETY STEEL TOE WORK SHOE BOOTS 8 W

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