An angler's boot, also known as a WADER, is a type of footwear designed to be worn while fishing in shallow water. It is typically made of waterproof material and is designed to keep the wearer's feet dry while standing in water. The term 'WADER' comes from the Old English word 'waedere', which means 'to wade'. Waders are an essential piece of equipment for any angler, as they provide protection from the elements and allow the angler to move around in the water with ease.