hello, my name is Julen, I'm french and i would like to buy a paddleboard  for life saving. But I don't understand how does your different kinds of boards work ! For example, I was interested in semi-handshapes paddleboards, but I saw that there was only killa models in this type of boards . Is the Killa board an greater board ? or is this board made for massive people like someone told me ?Also, I didn't see sizes in your paddle ... why ?