I've had great luck with Heat Demons, 2 sets on 2 machines. All the machines in our group run them as well.
Couple variations to choose from, 2 zone (hand and thumb only), 4 zone: hand, thumb, then add: seat, visor, or what ever else you want (vest or gloves even for those with hand issues).
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Long gone are the times when things were made of wood, and men made of steel.
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