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I ride these ritchley grips bare handed, there are ok 1000 times better than rubber grips but if its that hot and your sweating that much then they do get wet and become slippy, so you have to squeeze them out and let them dry for a few mins.
I say buy these grips see what there like personal i think there assume! BUT make sure you get some nice big bar ends that cover the edge of the grips other wise you will have trouble with them tearing!TheasOr something similar to them i just use some plastic ones but the ones they give you just aren't big enoufgh.
And if you still have a problem with sweat with them wear gloves ???
Sam