i have used nylon since i started using clips. was using doubles for a while, then when i got the soma hellyer pedals started using only one strap. its not too bad, and i don't have to cinch it down when i ride with my regular shoes, but when i ride with running shoes i do have to tighten it then loosen it when i stop. i don't think i lost anything as far as power transfer by going back to only one strap.