These baths are moulded in one piece of acrylic, and have the clean lines of a traditional stone bath.
If the bath comes with an overflow, the overflow and waste are usually supplied as the overflow pipe is built into the bath.
If it doesn't come with an overflow, you'll need a slotted bath waste.
These baths are sometimes preffered to stone baths as they aren't as cold on the body, and are easier to maintain.