Lug Sole Boots are any styling of boot that has a heavy, rubber (or other synthetic) outsole. Lug Sole Boots will typically feature a rugged tread on the outsole.
About Steel:
Steel is a material that comprises the front of Steel-Toe Shoes and Steel-Toe Boots. Steel is inserted in the tip of a boot and is meant to protect the foot from harm. Steel is often found in Construction Boots or Work Boots.