SwimSchool Swim Trainer Vest Ages 4-6

I needing something to transition my kid to something that had arms free/out of the puddle jumpers where the arms have floaties so its hard for them to move arms properly when learning or practicing swimming. Even though the arms can move freely with this vest we found there are so many other issues that prevent it from working properly for our intended use...learning to swim. My kid is, average size, and the vest fits perfectly, size wise and even a bit to grow. I will note there is zero way to adjust the size of the vest itself (*). The through-the-leg safety strap is so bad it cannot be used. But yet the vest is safety hazard if it's not used. No matter what length we have it adjusted the leg strap to it is either cutting into their you-know whats, or even off to the side is painful and annoying. Or its too loose so the vest rides up into the child's face. Not using the strap results in the vest pushing up into and covering the child's face while in the water. There is a small awkward patch that is supposed to be used on the leg strap to help buffer but it doesn't stay put and does not help buffering. The vest has a gap on each side (so basically a front panel of flotation and back panel of flotation) and its joined together by the neoprene type material. This us a very common design but I noticed that it caused my kid to rotate over on her back in the middle of freestyle practice. I'm sure its a common thing but it really is preventing proper learning of the first/basic freestyle swimming stroke. Working on basic freestyle strokes they rotate their body to bring one arm out behind them to bring forward/ahead of them, this rotation puts them on that side gap that has no flotation. Whay we found was that it then pushes her over onto her back/chooses the larger flotation side, which is the back peice. We are working to try smaller strokes/rotation so she can stay on her belly but its not working so well. Almost any rotation throws her on her back. We were practicing outside of swim school, then we go back to swim school and the teacher basically says that even tho these are billed as swim aids they are not, due to all the stuff I just mentioned lol. She says these should be used just as preventative drowning devices for like a boat, water park etc, for kids who have outgrown other floatations. So don't believe how this is listed, this will not help that much for learning to swim. * it says ages 4-6 so if you have a small or average size 4/5 year old then I wouldn't be suprised if this ended up being too big as there is no way to adjust size.