Easiest way to tell? Take a spot you don't care about, and see if it melts. MB Tex does, leather doesn't. Also, if you can see the back of the material, MB Tex looks like cloth.

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Bill Streep
San Antonio
'57 190SL (toy)
'08 S5500 (mine)
'09 CLK550 (wife's)
'06 SLK350 (daughter's)
'11 GLK350 (daughter's)
'03 CLK310 (spare)