Constructed from a lightweight and abrasion-resistant microfiber upper and is reinforced with strategically positioned TPU protectors the Stella SMX-1 R v2 features a rubber compound sole with superior grip patterning for excellent grip both on and off the bike, while the accordion flex zones give support and control regardless of your riding position. Advanced microfiber main upper construction. Soft TPR heel insert allows freedom of ankle movement. Ergonomic TPU shift pad and boot shaping for forefoot streamlining. Angled closure strap follows natural shape of riders instep. Front Velcro closure system, with reverse zip. Thermo-welded flex grooves control flexion and flexibility. Double-density ankle protector on both sides. Replaceable bi-injected TPU forefoot slider. External, high modulus TPU heel counter.