I bought Grip Shield because my hands sweat playing golf on hot days. The product keeps my hands relatively dry without being sticky, which improves the grip on my ungloved hand, and keeps the glove fairly dry on the other.
Grip Shield would have gotten 5 stars if it was more reasonably priced. (I paid $12 for a 1.5 oz. bottle.)
I recommend this product if you have a problem with sweaty hands.