they bite into the palms.....i have 2 summit vipers and 3rd one that i borrow from time to time,absolutly love them.....i can jump up and down with no slippage as long as i make sure it's in....

Amen...I love mine too..I wouldn't mind getting one more..the Goliath. What concerns me mostly about the water filled palms..is my weight .I'm presently in the 280s. BUT with your word Huntnma..I plan to try some Palms out.