US 12W is the useful fitting detail
This listing offers a men’s leather work boot in US 12 W. Unlike a general wide-toe marketing phrase, that suffix identifies the offered width route. It still does not provide internal cap dimensions. Compare the front and instep with work socks, and check whether the heel remains seated when the boot bends. The title supplies neither a precise model code nor a boot-height measurement.
Three resistance claims, three questions
Oil resistance can concern damage to sole material; it does not establish traction on oil. Ask which surface and contaminant support the slip claim, and what exposure supports heat resistance. Do not expand that last phrase into welding, molten-metal or electrical protection.