One of the primary tests required for climbing spurs to meet the federal ASTM standard measures metal fatigue. This test requires simulation of a climber in use by mechanically applying 350 pounds offorce 500,000 times. Testing on the T2 climbers was stopped after more than 1,000,000 cycles, remarkably, without failure! All climbers shipped without pads or upper straps. These climbers are compatible with all pads in our catalog.