shampoo hat; shampoo visor
A broad-rimmed, topless cap worn especially by young children during hair washing to keep shampoo out of the eyes. A wasei-eigo term; the product is a trademark.
wasei-eigo (Japanese-coined English), from shampoo hat
I put a shampoo hat on the baby and washed her hair.
Using a shampoo hat keeps children from complaining about their eyes stinging.