Skillbuilders half rolls are made of molded foam coated with a tough integral washable coating. Half rolls combine stability of a wedge with the positioning versatility of a roll. Use Velcro hook on flat bottom to anchor roll for additional security. Provide stable base for knee flexion and extension. Heavy duty positioning and vestibular half rolls are ideal for institutional use in physical therapy departments, home use, special education programs, pre-school programs, physical education classes and the gym.