Boots that rise to the knee and were originally made of leather, can be made of a synthetic rubber that exhibits good chemical stability, and is produced by the polymerization of what?
Knee-high boot Knee-high boots are boots that rise to the knee, or slightly thereunder. They are generally tighter around the leg shaft and ankle than at the top. Originally made of leather, versions made of a synthetic rubber (PVC, Neoprene, etc.), they are used by fishermen, dairy workers, stable hands, duck hunters, clammers, etc. to protect the feet from water, mud, manure, etc. and to provide traction on slippery surfaces. Most slip on, but there are varieties with buckles and those that lace up.
Foam rubber Foam rubber (also known as cellular, sponge, or expanded rubber) refers to rubber that has been manufactured with a foaming agent to create an air-filled matrix structure. Commercial foam rubbers are generally made of either polyurethane or natural latex. Latex foam rubber, used in mattresses, is well known for its endurance.