Your kayak is not exactly a lightweight. Or perhaps you"re planning on a long trip and want to go with wide straps for maximum boat-hold. Grab the NRS 1. 5in Heavy-Duty Straps. NRS manufactured these polypropylene straps to a tensile strength of 1500lb (tensile strength is the stress at which material breaks) and coated them with UV protectant. Two center-mounted stainless steel springs in the buckles apply pressure evenly across the width of the strap for a secure hold.