These yellow and magenta foam earplugs offer a high NRR of 32 dB, ... Certain materials, such as foam, may be easier to mold to a person’s ear. Materials: ...

A large pile of yellow foam, photographed on Georgia Street outside the US Ecology hazardous waste facility by a nearby resident in August 2013, was soap-related and not potentially harmful ...

The water was "covered in a really heavy, dense, yellow foam, with a fair bit of green, slimy, scummy stuff on the beach at the sidelines," Mr Rowland told The Guardian.