An intraluminal ultrasound imaging device includes a flexible elongate member configured to be positioned within a body lumen of a patientAn ultrasound imaging assembly is disposed at the distal portion of the flexible elongate memberThe ultrasound imaging assembly includes a plurality of acoustic elements and an acoustically-transparent window disposed over the plurality of acoustic elementsThe acoustically-transparent window comprising a plurality of layers formed on top of one anotherThe plurality of layers includes an innermost layer directly contacting the plurality of acoustic elements, an outermost layer opposite the innermost layer, and an adhesive layerThe outermost layer includes a tubingA hardness of the innermost layer is less than hardnesses of every other layer of the plurality of layersA hardness of the outermost layer is greater than the hardnesses of every other layer of the plurality of layers
