Inspected and tested in accordance with U.S. Coast Guard regulations. All rings contain unicellular polyurethane foam for buoyancy. Floating polypropylene grab lines contain UV stabilizers to enhance sunlight resistance. PE and vinyl skin versions feature molded-in becket design; vinyl coated foam versions use sewn beckets to secure grab line. Choose between energy absorbent vinyl skin; vinyl coated foam; or tough; hard shell polyethylene skin. SOLAS approved models equipped with reflective tape.