I am unable to determine the exact frequency or duration of use as this is not my personal item. From what I can see, there are no tears or noticeable stains, and it appears to be clean. It can still be worn for a long time. [Product Description] A baseball umpire shirt from Maruesu is now available. It has a comfortable, soft texture. The mesh material is excellent at absorbing sweat and drying quickly, keeping the inside of the garment dry. [Suitable Size] 2XO: Chest 104-112cm, Height 185cm~ [Product Details] Product Name: Maruesu Umpire Mesh Shirt Half Manufacturer: Maruesu Type: Short-sleeved, half-button type Color: Sax Material: 100% Polyester Please refrain from purchasing if you are concerned about used items.