Knut Jaeger of Kirchheim Teck, Germany, has developed and patented a ventilation system for use in clothing, reported US Fed News.

The report, which cited the US Patent & Trademark Office, said the system - which is especially useful for watertight sports clothing - contains ventilation openings covered by shingle-like overlaps of the fabric.

"The air openings are closed by a flexible, three-dimensionally cross-linked spacer material," the patent office said.

The inventor was issued US Patent No 7,043,767.