RestAngles is a cleverly designed, adjustable, extremely portable footrest. Popliteal height is the distance from the bottom of the foot to the area behind the knee. While sitting, the average P.H. is 15-19.9". The average chair seat height is between 17-19". The gap between those averages means legs dangle, causing pressure on the back of the knees, pain in the lower back, hips, and lower extremities. Comfortable sitting posture happens when feet can rest flat on the floor. RestAngles can help! Assembly is easy. Simply placing it under those feet, the lower extremities are supported and comfy sitting posture ensues. From here to there and everywhere in between, RestAngles is the portable posture hack that brings the floor to your feet.