Alpinestars Bionic Karting Rib ProtectorThe Alpinestars Bionic Rib Protector is ergonomically constructed to provide protection for the ribs and kidneys. Its lightweight design uses intelligently designed adjuster placement for a comfortable, custom fit. The durable cordura construction incorporates dual density, ergonomically shaped protectors constructed from a robust PE hardshell, with a fiberglass core for impact and shock dispersion.