The "Classroom" designation also implies ADA compliance. The 6x density provides enough firmness for wheelchair wheels to grip and roll without sinking (as they do in sand or grass) but enough give to prevent vibration fatigue for the user.
: The track immediately spiraled into a massive vertical loop. Leo held his line, feeling the G-force (even if only in his mind) as his car clung to the ceiling before diving back toward the gray asphalt. classroom 6x poly track