I use a waist harness and a seat harness. The seat harness is better for longboard sailing eg Mistral One Design, Equipe and also Windsurfer LT, at least in my opinion. For wave and slalom I think the waist is best. What about foiling? I use a waist harness for foiling but I am still very much learning. I notice Aaron McIntosh top NZ sailor uses a waist harness (see below) what do the foilers here recommend ?