The new models, however, are made from lightweight metals, sport faster and more shock-absorbent wheels, are narrow enough to thread through congested sidewalks and have .
Aero 90s ($289) also have more shock-absorbent soles, an antibacterial foot bed and a formfitting lining so your feet don't sweat so much.
They are still made with layers of suede, jute and cork, with the sole contoured to the natural shape of the foot and a shock-absorbent foot bed.