As with all Vivo shoes, the Flex also has a wide toe box to fit the natural shape of the foot, a knitted upper, and is lightweight (280g). Vivobarefoot says these features prime the Flex for ...

We think Vivobarefoot’s boots and shoes are as close to walking barefoot ... with plenty of room for toes to splay out and a zero drop sole for a good connection to the ground.

Vivobarefoot clearly had aquatic environments in mind when designing these shoes – the Ultra Bloom ... more protection for your heels and toes than open-toed sandals or flip flops.