waist support seat cushions long-sitting office cushion waist support chair for sitting posture correction student children correction pad ergonomic chair

gray black ankela red emerald blue rose red light pink triangle gray triangle black elegant purple elegant gray olive black gray [get waist pillow + fixed strap for free]] black [get waist pillow + fixed strap for free]]

small size 32*29 * 29cm large size 36*30 * 32cm 42*32 * 30cm 42*38 * 44cm