KNOX offers you its META-SYS back protector:

Material:

• Featuring hybrid technology, the combination of hard plates that distribute the force of impact and EPP inside to absorb energy and resist repeated impacts.
• Exterior polypropylene plates distribute impact and stop penetration
  
• Shock-absorbing EPP core inside for multiple impacts
• Shoulder blade pads on shoulders
• Removable, breathable lining in British-made midsole fabric for improved air circulation

The "+":

• Back protector with 4 separate, independently moving sections
• Unique extension system on back protector lengthens when rider leans forward and shortens when rider straightens up
• Air intake system for ventilation
• Multiple waist adjustment system for individual fit
• Additional side adjustment straps for a more secure fit against the spine
• Soft, quick-release shoulder straps that can be crossed for added comfort
• Machine-washable for continuous freshness