These functional advantages are a reality because Geoprene is 98% water impermeable. Old-fashioned neoprene suits are like a sponge. They soak-up water. They get heavy. And they drag you down (while making you shiver). Conversely, Geoprene absorbs little-to-no water. Coupled with Matuse’s patterning, a Matuse suit never feels or functions like a cold, clammy bag of bricks on your back.