The Kraken Sports Adjustable Lift Float Arm is made from kevlar material which makes it lightweight yet very sturdy and can take an abuse. Aside from that, this particular float arm has an innovative feature which is an adjustable lift. You can now easily achieve a neutral buoyant camera rig. You can adjust the buoyancy by pressing the button and letting the water inside the float arm. The float arm has a screw top with double o-rings to keep the float arm sealed. You can also drain the float arm by unscrewing and dumping the water.