The U curved is a head joint for the standard model flute that has been curved into a U shape so the instrument is more compact. This is so people with a small body frame can hold the instrument without having to reach beyond his or her capabilities.
Waders are a style of waterproof gear designed to allow people to stand in relatively deep water without getting wet. There are two basic styles, hip waders and chest waders, and when they are worn with a warm insulating layer, they can be extremely useful in cold, wet places. For some jobs, this gear may be required while at work, to ensure that employees are protected from the elements.
1 : a horse used in war : charger. 2 : a person with long experience in a field; especially : a veteran soldier or public person (as a politician) 3 : something (as a work of art or musical composition) that has become overly familiar or hackneyed due to much repetition in the standard repertoire.