Alpinestars - SMX-S BootsDurable, high tech micro fiber upper construction offering a high level of flexibility. Double injected PU shields the shin, ankle, calf, toe and heel from impact while minimizing abrasion. Inner protection is given by a double injected panel connected to the heel counter, hidden beneath the outer shell and running up the outer ankle. Quick drying polyamide lining is laminated with open cell foam and high density contoured padding to absorb shocks to