The upper is made from an ultra-light weight, breathable microfiber fabric. It has large side aeration and a conforming, carbon-fibre reinforced heel for maximum containment of your foot while pedalling. A double, inextensible-Velcro strap closure plus a moulded P-Bax strap on the instep, equipped with the new SMC3 fastening system, whose adjustment lever has been redesigned to be even lighter and for better ergonomics.