ok update, I just got back from the walk. HAppys held up perfectly, Misty had a couple glitches, nothing not easily fixable though, her first leash ring broke before we got out of the yard, I simpley switched to the extra strong ring which held up without a problem, the second glitch was the adjusting ring came loose, but that was my own fault I forgot to attach it properly lol the martingale design worked perfectly, and they both passed the durablity test