see this.

Too much info up there? Here's the bottom line.
For your body
  • No heel height. Move as you should naturally do.

  • Right firmness. Stay stable. Feel the ground.

  • Bends easy. So you don't waste energy on it.

For your everyday
  • Light. Enough to not catch attention.

  • Tested for endurance. Passed by some margin.

  • One-layer ventilated upper. Lets air in and heat out.

"It's easy enough to not notice them."