A phenomenon common the men wearing hip waders or chest waders. The rubbing of the waders in the groin during movement causes an erection to develop - the wader effect. Further stimulation can cause an
ejaculation (
supreme wader effect) and the semen will run down the outside shaft of the hip wader; this sometimes left to dry as a trophy. When the
supreme wader effect happens in chest waders, the semen is trapped inside the wader and needs to be cleaned up. Some men wear waders for the purpose of creating the wader effect.