You don't need to fight to stay down...that is not good. I wear a 3/2 one piece with 10 lbs in salt water and I sink like a rock with my transpac but I would rather pump up the air in the wing than I would fight to stay down. My bottom time has increased significantly with my transpac. I am so proud. I was able to get 30 minutes with a max depth of 100 and avg of 75 last Sunday.