When sourcing rescue belts, the most critical factor is the tensile strength and load-bearing capacity. For professional use, ensure the webbing is made of high-tenacity polyester or nylon with a breaking strength of at least 22kN (approx. 5,000 lbs). Hardware, such as D-rings and buckles, should be made of drop-forged steel or aerospace-grade aluminum to prevent corrosion and mechanical failure. Additionally, look for reinforced stitching (box-stitching) at stress points to ensure structural integrity under extreme tension.