hook and loop fastener material to and covers the surface area of seat back rest surface 14 to provide a padded seat back 12 a seat assembly 24 is positioned on seat back foam layer 22 and secured to seat back 12 near its bottom end 20 seat assembly 24 is of shorter length than that of seat back 12 seat assembly 24 includes a vertebral column 26 of nine lengthwise parallel aligned beveled vertebral members or slats 28 b and corner vertebral members or slats 28 c of equal lengths positioned between a seat mount 36 and a seat base 38 beveled vertebral slats 28 b have beveled ends 30 b and corner vertebral slats 28 c have right angle corner ends 30 c vertebral column 26 is formed with a beveled vertebral slat 28 b at each end between the ends of vertebral column 26 is an alternating sequence of beveled vertebral slats 28 b and corner vertebral slats 28 c such that each corner vertebral slat 28 c is positioned between two beveled vertebral slats 28 b fig6 is an exploded view of folding seat 10 fig7 a and 7b show the construction and operation of seat assembly 24 in respectively the unfolded state of fig1 and the folded state of fig2 and fig8 a 8 b and 8 c show several views of beveled vertebral slat 28 b marked with preferred dimensions with reference to fig1 2 6 7 a 7 b 8 a 8 b and 8 c first and second spaced apart spring bands 40 and 42 secure together as a flexible unit seat mount 36 vertebral column 26 and seat base 38 the last of which having a seat surface 44 a second or.