What pen can children use to write their names on bedding when they enter the park?

Stationery stores sell "marker pens", which are not easy to wash off.

Many name stickers are sold online now, and they need to be sewn on clothes or quilts by themselves.

There is also a name seal, which is not easy to wash off.

marker

is a pen that can write marks or signs on one or more materials such as paper, wood, metal, plastic, enameled ceramics, etc. Markers are divided into oily markers and water-based markers. Water-based marker pen can write on smooth surface or whiteboard, which can be erased with rag, while oily marker pen is not easy to erase.