How much does a black walking boot cast below the knee weigh?

Answer 1

Depends on what type of padding is used and the volume of cast material built onto the outside and even the type and volume of the brace and density of the plaster.

A light weight boot cast could weigh as little as a few ounces if it is just a very simple protective shell, or it could weigh up to several pounds if there is a metal brace included, or extra padding, or a crush protection bar, or the variety of other options that may be needed.

Casts are essentially custom made, and no two are going to be 100% identical.