slush moulding BrE technical
slush molding AmE technical

Most domestic manufacturers use the injection moulding process for manufacturing the subject footwear; two manufacturers also use slush moulding.

Slush moulding and injection moulding are the two most common moulding processes used in the manufacturing of the subject finished footwear and bottoms.

SMAC further submitted that, although slush moulding cannot replicate the range of waterproof footwear produced by injection moulding, virtually any design capable of being made by slush moulding can be made by injection moulding.