Alpinestars presents its MX Air Kidney Belt:

• A lightweight and breathable motocross lumbar band featuring the completely ventilated Bio-frame support system.
• Ergonomic design for maximum stability of the torso and lumbar area.
• Innovative completely ventilated Bio-frame back support system with raised details to prevent slipping and
  keep the band in a comfortable position.
• Very fine perforated jersey fabric sewn onto the main Bio-frame structure for unparalleled breathability and moisture dispersion.
• The size adjustment system using double tightening employs a closure system with very
  durable hooks and loops to evenly distribute support across the lumbar area.
• It is adjustable for a customised fit.
• The front edges feature a windproof membrane placed
  between the layers.