If you use this (I have what looks to be the same thing with a different logo) you only inflate about 1/2-3/4 full. Then it works pretty well. Full inflate and there is a big lump on the back.
If you use this (I have what looks to be the same thing with a different logo) you only inflate about 1/2-3/4 full. Then it works pretty well. Full inflate and there is a big lump on the back.