The new materials available have resulted in jackets that are warmer even when wet, lighter, more compact, tear resistant and fashionable. The most important area of improvement is functionality of these new products. The main areas of improvement are in waterproofing, wind proofing and breathe ability.

Waterproofing is perhaps most obvious idea and potentially most important as well and is linked to your jackets ability to breath. Your body heat will be drained off very quickly if your clothing is wet make you cold much faster. Waterproofing has moved way beyond a simple chemical coating. Now it is at point where there is a standard for waterproofing that is measured by how many centimeters of water can rest on top of material before leaking through. The best fabrics can support tens of meters of water before leaking!

Waterproofing is more than just type of fabric used since final product is only as strong as its weakest link. What good is a waterproof jacket of water can pour through zipper? A good quality waterproof jacket will have many extra features built into it that may not be visible. For example a jacket should have all of its seams sealed with a waterproof tape, zipper should be covered, inner layer must not absorb water and entire jacket should be made of waterproof materials not matter what section is.

While being into water, a diver is in a heavier environment than when he is in surface due to fact that water is a denser medium than air. The relationship between density of environment, its pressure and way it affects human body are explained through several physic laws, among which we can specifically find Boyle's law, Dalton's law and Henry's law.