Hello! This is an old thread but wondering if you could answer what you think is best for what I make - I make slippers and end up sewing through quite a few layers: 2 of leather and then 2 of wool jersey and then a lining. It can be nearly 1cm thick by the time all the layers are together to join the sole. Can you advise whether it is best to get a true walking foot or if a top and bottom feed would be sufficient? I don’t use super hard leather, more like upholstery leather. Thank you.