The SMB-21-N is constructed of armor-like 1680 Denier Nylon with a coating of TPU fully shielding them from abrasions, tears or punctures.
The minimalist harnesses also give more chest room for easier access to attachments and better maneuverability underwater.
IST's 21lbs SMB's are the lowest profile streamlined buoyancy devices, which provide maximum balance and ideal, trim control. With IST's bladders, you move through the water easier and more efficiently.

• Complete, modular side mount bladder diving rig with 21lbs of lift
• Includes bladder, inflator, harness, tank rigging, crotch straps, chest straps and bungees
• Bladder constructed of 1680 Denier nylon with TPU coating
• Scalable from single tank recreational to double tank technical
• All metal parts constructed of corrosion resistant stainless steel