A brake assembly for inline skates having a boot portion with right and left downwardly directed frame members. If desired, stretching conditions can also be chosen to significantly reduce the denier of the line. A method for measuring the flow of a fluid andor the presence or the level of a substance uses the sensor device. The umbrella has a double layered canopy that allows wind to pass through without inverting the umbrella, and may have a telescoping shaft to permit it to be stored compactly. An MFD-match is achieved with well-defined fusion currents and fusion time. Further they are alternative substrates for malodor producing enzymes.