It's also fitted with strong suction cups that hold securely inside a bathtub, preventing slipping while bathing or standing, and the perforated design handles drainage to keep the surface from holding standing water long-term.
The oval outline follows the curve of a bathtub more closely than a rectangular or round mat would, sitting flush once installed, which makes it a common choice for custom-print mats used specifically inside bathtubs.
Because the interior of a tub is a constrained space, the oval mat's cut and sizing is usually adjusted with some flexibility to account for differences in inner-wall curvature across tub brands — customers can share the actual interior dimensions of their tub before ordering to get a closer fit.
The oval shape also gives printed designs a softer presentation, without the harder right angles a rectangular mat would show at the edges, which suits custom requests built around softer imagery like portrait photos or floral illustrations.