Neutrally buoyant, breast implants float and sink in the manner your movements dictate and, just like natural breast tissue, will go as far underwater as you take them. However, competitive swimmers may find some slight drag created by the larger size of augmented breasts.

People with a high muscle-to-fat ratio tend to have dense legs, which resist floating horizontally. Because dense legs are less buoyant, they tend to sink, increasing drag. Practicing kicking drills to improve your kick will help you gain additional lift and propulsion to help counteract sinking legs.

Fat is less dense than water, and floats very well. Muscle is much more dense than fat — more dense than water, which means it doesn’t float. Fat is less dense than water, and floats very well. Another answerer said that they could tread water for a long time if they had to, because they’re very muscular and strong.

Saline implants are neutrally buoyant, meaning that they will neither float nor sink. Silicone implants, however, are a little more dense than water and will have a slight sinking effect. But they will not completely sink and essentially float as well.

Swimming After Breast Augmentation Most women can get back in the water around 3 weeks after surgery. Also, make sure your incisions don’t stay wet for an extended period of time after swimming. Whenever you get out of the water, be sure to dry off properly and avoid staying in your damp swimsuit top for too long.

Materials which are lighter than water (specific gravity less than 1.0) will float. Most materials have specific gravities exceeding 1.0, which means they are heavier than water and so will sink. Unfilled Silicone rubber has a SD of about 1.10 – 1.15; ergo, it will sink.