-- My buddy ordered a 400.00 st. Croix legend rod. I wanted to know if anyone knew what this handle was made of? I figured i could duplicate it if I knew what the material was.

It looks like plastic.

Probably could be duplicated using foam cores covered with a soft touch shrink tube like the SST shrink tube sold by PAC Bay..
Norm

Xtreme-Skin handle repels water, dirt and fish
slime and cleans up easily. Manufactured by
St. Croix to provide outstanding angler comfort,
casting efficiency and sensitivity

---------------------------
St. Croix uses the words - Xtreme-skin. Based on these words; one might believe that it is a foam based - carbon over - epoxy grip.

Take care

It's not carbon, closer to a shrink tube but more likely a painted on thin vinyl type coating. Think something like "plasti-dip."

.........

Looks very similar to Pac Bays ready form grips which are molded to the exact shape of the grip to eliminate surface voids from sanding a handle to the shape from a foam blank. Saw these at the last ICRBE, looks like a good product which I hope to try out soon.
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It looks to me like the "final skin" is applied AFTER the grips are installed. Not sure if painted, dipped, or shrink tube.

Like the grip, hate the butt cap, it looks like aluminum and it slides off everything, never picked up a rod off the deck, etc. more times in my life.

If you have a slipping issue, just put a rubber chair leg tip on the end of the rod and your slipping days will be over.

Be safe

i handled some of those about a month ago. cool grips supposedly gripper when wet. i think its a proprietary , patented grip.