Massage Jets: You can see several small, silver circular nozzles (jets) built into the sides and back. These are designed to spray pressurized water for a "spa" effect.
Contoured Design: The inside is shaped with curves to act as armrests and a headrest for comfort while sitting.
Textured Floor: The bottom of the tub has a bumpy, non-slip texture to help prevent sliding when it's wet.
Material: It appears to be made of smooth acrylic or fiberglass, which is standard for modern lightweight tubs.