Waders refers to a waterproof boot extending from the foot to the chest, traditionally made from vulcanised rubber, but available in more modern PVC, neoprene and Gore-Tex variants. Waders are generally distinguished from counterpart waterproof boots by shaft height; the hip boot extending to the thigh and the Wellington boot to the knee. They are therefore sometimes referred to as Chest Waders for emphasis. Waders are available with boots attached or can have attached stocking feet (usually made of the wader material), to wear inside boots.
The first manufactured waders were made as early as the 1850's by a company called Hodgman. When rubber became popular around 1912, they started making the waders out of this particularly waterproof and durable material. Then rubber was more or less perfected in 1942 for World War II, so they used the same technology to make waders that are closer to what we have today.
There are two main types of waders: stocking-foot and boot-foot. Stocking-foot is separate from the boot and connects to it, while boot-foot includes the boot already.
Waders have a wide range of applications. Regarding leisure purposes, they are worn while angling, water gardening, playing with model boats, waterfowl hunting, and off-road riding of All-terrain vehicles. Industrially, heavy-duty waders are used by predominantly in the chemical industry, agriculture and in the maintenance of water supply, sewerage and other utilities. Waders are frequently worn by pastors during full immersion baptism and have an important application during flooding, while walking along the streets or indoor.
Trench foot is common in those who spend a lot of time in the water without proper protection. People like fly fishermen use waders because they stay in the water for hours on end, and they need the proper protection.
Depending on the kind of fish that the fisherman is catching, they might not need waders. Some fish are best caught on land. But some fish are best caught when the fisherman is soaked and chest deep in the water. Waders are also essential for keeping warm during colder months, because they keep the cold water off the skin, which otherwise could cause hypothermia or other problems.
Environmental Impact 
Many states in the US are beginning to ban certain types of waders, specifically those with porous, felt soles. These kinds of soles easily host various types of invasive species that could be carried from one water source to another. The invasive organisms and plants pose a threat to fish stocks and important fish habitats. For example, effective March 1, 2012, most counties in Missouri ban these kinds of waders while sport fishing in fresh water. And in all of Alaska, as of January 1, 2012, the same law applies.
- History of Chest Waders by ChestWaders.org. Retrieved 12/5/12 http://www.chestwaders.org/chest-wader-articles/history-chest-waders
- A brief history of rubber by Mongabay. Retrieved 6 December 2012. http://www.mongabay.com/10rubber.htm
- Bootfoot or stocking foot waders? Orvis News, 24 September 2012.
- Medical Dictionary EMedicineHealth. Retrieved 5 December 2012.
- "Felt-Soled Wader Ban." Missouri's Fish, Forests and Wildlife. Retrieved Dec. 05 2012. http://mdc.mo.gov/fishing/regulations/felt-soled-wader-ban
- Preventing invasive species Alaska Department of Fish and Game. Retrieved 5 December 2012.