A 'shā tān tǎn' is a portable, often waterproof or sand-resistant blanket specifically designed for use on beaches. The word combines three characters: 沙 (shā, 'sand'), 滩 (tān, 'beach' or 'shore'), and 毯 (tǎn, 'blanket' or 'rug'). Together, they literally mean 'sand-beach-blanket' — a compound noun that clearly signals its purpose and setting. It’s commonly made from quick-drying, lightweight materials like polyester or nylon, with features such as sand pockets, corner weights, or carrying straps.

This item is widely used by families, beachgoers, and picnic enthusiasts in coastal areas across China and other Mandarin-speaking regions. Unlike general-purpose blankets (毛毯 máotǎn), the 沙滩毯 emphasizes functionality for outdoor seaside environments — resisting sand accumulation, drying quickly after water exposure, and staying stable on uneven surfaces. It’s a practical, everyday item during summer vacations and holiday travel to seaside destinations.