YAJU Material: outer layer: polyester satin, internal layer:EVA Oversized design is perfect for all hair lengths and thicknesses This cap is super effective, quite durable and very comfy, double layer, elastic around the edge Top diameter approx 10.6 inches, elastic perimeter is about 16.1 inch/ 41 cm (before stretching), stretch up to 32 inches/ 82 cm approximately. Weight:35g color: as show Using double material sewing, EVA super waterproof, polyester satin smooth and supple, Stitches closely firmly, Durable and long lasting.