These terms refer to specialized vests designed for volunteers or team members, serving as uniform work clothes to identify members, enhance unity, and facilitate role recognition in group activities. Available in a wide range of sizes—M (Medium), L (Large), XL (Extra Large), XXL (Double Extra Large), XXXL (Triple Extra Large), and XXXXL (Quadruple Extra Large)—they cater to diverse body types, ensuring a comfortable fit for volunteers of all builds.