ISPA Universal 。Nike ISPA Universal have a futuristic feel to them with their curvy waves, rocky bumps, and marbled aesthetic. Made of 100% rubber, you’re guaranteed to stay fresh and dry with this monochromatic grey footwear thanks to its cut-out sections that ensure optimal breathability. And to top it all off, this shoe is totally eco-friendly, having been crafted with Bio-EVA foam and moisture-absorbing replaceable cork insoles and, to reduce waste, no glue was used in the process. A quality slip-on model for sure, complete with a foam rubber sole and ventilation holes.