http://www.tennis-warehouse.com/Dry_Grip_-_Antiperspirant_Lotion_2_oz_Tube/descpagePYTHON-DRYG.html had chances to test this product out. I have very sweaty hands and do not like the tournagrip which is like a cloth. so I use Wilson overgrip, or yonex supergrap. These are fine in dry winter time, but in Humid summer, my hand sweat and it becomes slippery. which means loss of spin and more mishits. But I got to try this out today. I apply it to my hands and rub it in before the match and my hand stays DRY. I reapplied about every 4 games and works GREAT. My hand stays DRY in 90 degree HOT humid weather and therefore I had very good sure grip. Which means MORE spin and better racket control and less twisting of racket. This Stuff really works, guys.