Umbonium vestiarium, common name the button tops, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.[1]
The solid, rounded shells are up to 2 cm wide. They are similar to Oxystele but are more flattened and show a glossy, highly variable and colourfully patterned exterior.[1]
They can be found on eulittoral sand.
Indo-Pacific.
In Vietnam, they are called "ốc ruốc" and commonly sold as a snack.