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To measure your X-Seam, sit flat on the floor with your back reclined against a 30- to 48-inch board angled 14- to 15-inches from the wall and measure along the floor from the board to your heel. Be sure your buttocks are pressed against the board and your legs are flat on the floor. If you're close to either end of the X-Seam range, just ask us and we'll help you choose the proper size.