Nano Foot Roller Options:Nano Foot Roller (Orange) RB6416 6" Above Mid Knee 6" Below 6" Above Mid Knee 6" Below X Small 12 1 4" 13 1 4" 11 1 2" 12 1 2" 10 3 4" 11 3 4" Small 14 1 2" 15 1 2" 13" 14" 11 3 4" 12 1 2" Small Medium 15 1 2" 16 1 2" 13 1 2" 14 1 2" 12 1 2" 13 1 2" Medium 16 1 2" 17 1 2" 14 1 2" 15 1 2" 13 1 2" 14 1 2" Medium Large 18" 19" 15 1 2" 16 1 2" 14" 15" Large 19 1 2" 20 1 2" 15 1 2" 16 1 2" 14 1 2" 15 1 2" Large X Large 20 1 2" 21 1 2" 16" 17" 15 1 2" 16 1 2" X Large 21 1 2" 22 1 2" 16 1 2" 17 1 2" 16 1 2" 17 1 2" XX Large 22 1 2" 23 1 2" 17 1 2" 18 1 2" 17 1 2" 18 1 2" Lateral Medial pad puts pressure on the patella to help reduce subluxations and dislocations Constructed to roll easily on any surface to allow the foot to receive an even massage Designed for patients suffering from plantar fasciitis