Increase extension in the lower and upper back while stretching the calves.
Board is made of a heavy-duty composite plastic.
Angle of incline adjusts to 4 levels and folds flat (3-inches) to store easily. Levels are 0 degrees, 5 degrees, 15 degrees, 25degrees, and 35degrees.
The last slot on the board makes an excellent hand-hold for stretching.
14″ x 14″.