Pulsating material?
I believe the answer is:
satin
This clue could be a double definition.
'pulsating' is the first definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I don't see?
'material?' is the second definition.
(satin is a kind of material)
Can you help me to learn more?
(Other definitions for satin that I've seen before include "Silky material" , "Rich cloth" , "Stain on shiny fabric" , "Saint (anag.)" , "Smooth glossy fabric" .)