Nike Bella Kai Thong Flip Flops Black Metallic Gold Womens NWT New. The Nike Bella Kai Flip Flop delivers the underfoot comfort of dual-density foam in a casual flip flop, ideal for all-day wear in warm weather. Soft, lined straps provide a secure fit, while the herringbone texture on the footbed and outsole add grip instead of slip. Synthetic and textile upper has soft-lined straps to comfortably secure your foot. Super-soft, dual-density foam delivers plush cushioning that lasts.