NEW boots are excellent, as are Premier Equine. i use close-fronted on baby horses so they don't frighten themselves if they hit a pole, and open-fronted on careless older ones.
RE not frightening a young horse - with some of them i actually prefer them to feel it a bit. For example i have a 4 year old with zero respect for show jumping poles (cocky bugger as well) and therefore used to be jumped knee to hoof in protective bandages, boots whatever they could find, meaning he could barely feel himself hitting the light poles. I think he actually liked knocking them down, like a game of skittles. I stripped him of boots, he knocked a couple down and felt it, and therefore jumps a lot cleaner now.
Mine jumps in Open fronted tendon boots and fetlock boots. This is because I want her to feel poles if she has one (which she doesnt like to anyway) but also she is quite clever in her outlook, so if she couldnt feel them, I think it would be a habit to have them
Ah but this little git likes to knock the poles off, and then play with them as they fall off. Usually culminating with stopping dead on landing and juggling a poles between fetlocks. Or he will hook them off with his hind legs and drag them forwards so they hit off his front tendons. He's mental. So, no protection for him and i get to claim a few clear rounds on his record.