Masai bare foot technology. They dont have a flat heel but a curved one. You roll into the next step, with normal gait heel strikes quite a strain on the body.
Plus the insoles are removable, I like comfort so I take the provided insoles out and cut nice thick 5mm poron insoles out instead.
The criteria for shoes to support the foot are;
Firm heel counter (the bit at the back, it shouldn't collapse when you push it down).
Fastens over the bridge of the foot. Velcro, buckles or lace are all acceptable. You shouldn't be able to take the shoe off without undoing the fastening.
Round toed.
Deep enough for the toes to not rub on the top of the shoe.
Now, if you look at MBT trainers and shoes they are suitable, as are normal trainers. Men's and boys trainers can be brilliant for women as they are cut on a wider round toed last.
Birkenstocks don't fasten over the bridge of the foot, as you walk your toes will grip onto the shoes, now with a high instep the toes are prone to curling under anyway. You won't notice it happening though. But it's worth noting as its not good for your feet long term.
If you've had a high arch foot it doesn't absorb the shock of walking very well, so the MBT make walking less of a strain on my body, I have high arches that pronate (go flat).
Boots are never very supportive, we recommend boots for occasional wear or wet weather gear, but not as an everyday shoe.