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A hip cast that extends from the waist to the toes on the affected side and from the waist to the knee on the unaffected side is known as a spica cast. This type of cast is specifically designed to immobilize the hip and lower limb, typically in cases of fractures or surgical repairs in pediatric or adult patients.

The spica cast is used to ensure that the hip and proximal femur remain stable while they heal, restricting movement effectively. The design of the cast serves a dual purpose: it provides support to the affected limb while also allowing for some mobility in the opposite limb, which is particularly important for certain patient populations.

In contrast, options such as the cylinder cast, long limb cast, and body cast refer to different types of orthopedic casts that provide varying levels and areas of immobilization. A cylinder cast typically encases a cylindrical area of the limb, while a long limb cast covers a larger portion of the limb but not in the specific manner described. A body cast encompasses a larger section of the trunk and limbs, serving a different function altogether. The unique structure of the spica cast is what best matches the description given in the question.