Komprex Small Kidney, 9 x 5.0 cm. Komprex Pads Breathable and permeable to water vapor. • Komprex High Density Foam Rubber – The use of foam pads and mouldings is recommended for anatomical indentations surrounding bony prominences (e.g. ankles, wrist, etc.). Pieces of foam rubber are cut to size and placed in the indentation. This results in a more even pressure distribution. Foam rubber moulds are also used to achieve localized pressure increases in fibrotic areas.