Kirkland Signature by Miraclesuit Riptide One Piece Slimming Swimsuit, Size 8 Imported Riptide Black, Size 8 Look and feel 10 pounds slimmer in the Kirkland Signature by Miraclesuit ladies swimsuit. Miraclesuit is constructed to shape and contour the body for a slimmer look without the discomfort of bulky linings or girdles. The Miraclesuit is constructed of an innovative new fabric called Miratex. Miratex has three times more spandex than the average swimwear fabric and provides triple the holding power.