Sorry for the lack of clarity angra.I understand all too well the problem of pressure on the backs of legs and knees, and footrests are rarely positioned well for me. Lack of leg/knee support is not a problem on these seats as there is a solid, padded leg rest extending directly from the edge of the seat, not just a footrest. If you haven’t already done so, you can look at photos of the seat/leg rest/footrest configuration posted by Delta https://www.delta.com/content/www/en...m-economy.html and on various review sites. It was the adjustable position of the footrest at the bottom of the leg rest that I could not master — not sure why — but I lost patience and left the footrest folded up and let my feet dangle at the end of the leg rest which ended just above my ankle. It was very comfortable.