How to measure your feet
  1. Stand on paper. Trace around your foot with a pencil held vertically.
  2. Measure heel to longest toe. This is your foot length.
  3. Measure across the widest point of your forefoot. This is your foot width.
  4. Compare both numbers to the brand's size guide before buying.
Measure both feet and use the larger measurement. Feet expand through the day, so measure in the afternoon or evening. Your barefoot size is often different from your conventional shoe size. Most brands use EU sizing.
Trace your bare foot on paper, then measure heel-to-toe length and foot width
What to check on any shoe
  • Foot-shaped: Is the toe box widest at the tips of the toes? Put your foot on top of the sole. If the shoe is narrower than your foot at the toes, it is not foot-shaped.
  • Flat: Place the shoe on a flat surface. Is the heel higher than the forefoot? That is heel-to-toe drop. You want zero.
  • Fixed: Can you fasten it securely without your toes gripping? Laces or a proper strap. For sandals, a heel strap is non-negotiable.
  • Flexible: Grab the toe and heel and try to bend it. Try twisting it. A natural sole bends and twists through the full length, not just at the ball of the foot.
  • Feel: How thick is the sole? Thicker soles reduce ground feedback. New to natural footwear? Start around 10mm and work thinner over time.
Making the switch safely

Two of the 5Fs can be adopted immediately with no risk: foot-shaped and fixed. There is no downside to switching to a wider toe box and a properly secured shoe, regardless of your history.

Flat, flexible, and feel need a gradual approach. If you have been in heeled, cushioned shoes for years, your feet have adapted to that. Moving to zero drop and thin soles too fast puts more load on structures that are not yet ready.

Think of it as a continuum. One end is heavily cushioned and heeled. The other end is fully barefoot. Natural footwear brands sit toward the barefoot end, but you do not have to start there. Find a shoe that is closer to natural than what you are wearing now and progress from there.

Your daily driver matters most. The shoe you wear for most hours of most days sets the baseline load on your feet. Change that shoe first.