Oyster Core Low Rise Pant USA KOOKA Oyster Low Rise Short KOOKA Australia Oyster Core Low Rise Pant KOOKA Australia Oyster Core Low Rise Pant NZ KOOKA. Meet the Oyster Core Low Rise Pant in Cashew: crafted from a supersoft modal spandex knit, these pull on pants sit just below the waist and fall into a straight leg drape that flatters every figure. Finished with discreet belt loops and a clean hem, they style easily from workdays to weekends.