 Its pneumatic fenders body is stronger than standard pneumatic fenders and is equipped with a specially designed counter weight to keep the fender vertical in water.Each SHPF system is customised specially for each type or class of submarine, depending on its water-air ratio, shape of the hull, berthing-type, energy absorption and jetty design.These fenders are typically made of a closed-cell Polyethylene foam core, which is encapsulated in a nylon or Kevlar reinforced Polyurethane skin.