First, always ensure your chestwaders don’t leak! You can do this easily by holding a flashlight (or your phone) in your waders in a dark room. Beams of light coming out in small pinholes might indicate a small hole. Patch using Aqua seal or Shoe Goo.
Neoprene chestwaders are appropriate for spring, fall and winter conditions but may be too warm for summer field work. Nylon chestwaders and Gore-Tex ® or breathable chestwaders are excellent choices for most seasons, where crew members wear warm layers (e.g., fleece, polypropylene) underneath during colder field conditions.