Nike Kepa Kai Men's Thong SPORTY, CASUAL COMFORT. The Nike Kepa Kai Thong delivers the underfoot comfort of dual-density foam in a casual thong, 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. Supersoft dual-density foam delivers plush cushioning that lasts. Herringbone texture on the footbed and outsole enhances traction to help prevent slip.