TAPITMinimalist barefoot sock shoes for women and men,Non-Slip Beach Shoes Fitness Sports Shoes,Ultra Portable Barefoot Aqua Shoes Socks for Beach Yoga

It is easy to slip on and does not take that much space. Fine for weight training or exercises with minimal friction.Not suitable for treadmill, even gentle walking, as the sole rubs off. It's non-breathable, so it's better with socks, which defeats the purpose.