a) any abrasive bodies wear out the the Barefoot wearing the ankle, but soft neoprene without unnecessarily large number of transitions
b) keep any strange stupid velcro system in which one wonders how can ever keep it, but Velcro closures that make up that name and also in outdoor activities
c) not completely fußbettlose sole, but a well-formed pleasant, supportive footbed
d) apart from the little orange stripes on the fasteners no flashy colors
e) As already mentioned a certain durability.
Hopefully the boot is also sold in two years :-) Until then, I'll have my current pair certainly gone a few hundred kilometers again.