This insulation for the drinking bladder prevents the liquid in the tube from freezing too quickly when the weather is cold.
Material
Neoprene is a foamed elastomer that is usually laminated on both sides with fabric (nylon or Lycra). This protects the surface, making it less prone to damage. We use neoprene for our hip belts, which need to be smooth, extremely flexible and durable. In addition, we appreciate the flexible and protective qualities offered by “Neo Belt”..