I live in the tropics and the humidity in summer is crippling even overnight , so sweaty hands and slippery picks are a real pain . i discovered a pick in a used case I bought at a pawn shop that had a hole about 3/16 dia punched in it , It sat on my desk for about 6 months until one day i couldnt find my usual pick , sweaty hands and no lose of grip . A bit of flesh from the pad of your thumb pushes into the hole and improves the grip , of course wher you put the hole will depend on how you grio the pick