The top wire of my fence is poly-tape and the bottom two strands are just regular smooth wire held with wood posts. I don't have my horses on it full time though because we don't have the electricity hooked up to it yet. The pasture I'm currently using is just t-posts with two strands of electric smooth wire. It was built quick and cheap, but it'll be getting a makeover one of these days. My horses haven't had a problem with not being able to see it, but that doesn't mean other horses won't either.