The original Puretrak Talent is 6.35mm thick so pretty damn thick. I like thick pads comparable to the QCK Heavy so it was an easy adjustment for me, but I could see how some would probably dislike its thickness.
https://www.puretrak.com/collections/mouse-pads/products/puretrak-talent-cloth-gaming-mouse-pad
Another issue I slightly have with the pad original PureTrak is the sharp edges at the front. personally, the front edge of the pad bothers my arm after long use... It's a bit sharp at the front so I use a sport sleeve to counter the sharpness. (IMO much nicer this way)
https://www.amazon.com/gp/product/B01J9D6LOW/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1
P.S. I never experienced this issue with the QCK Heavy.
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If you want a thinner version of the PureTrak their currently selling an XL version I just purchased because I love the feel of the PureTrak so much.
https://www.puretrak.com/collections/mouse-pads/products/talent-xl-cloth-gaming-mouse-pad
From the specs page, it is 3mm thick which would be perfect in your case as long as you have enough desk space.