The Low Low Profile platen is rarely needed, but sometimes with small or youth hats it is. The short platen height keep you from stretching the hat on smaller hats. This helps with preventing the printed image from frowning on the hat after printing. Then on the other hand, too short of a platen can cause the opposite effect with the printed image smiling on the hat after printing. The Hat Champ platen dimensions are below to reference.
Standard Platen - 6" x 3.375" (152.40mm x 85.73mm)
Low Profile Platen - 6" x 2.875" (152.40mm x 73.03mm)
Low Low Profile Platen - 6" x 2.625" (152.40mm x 66.68mm) The radius on the low/low is also smaller for smaller diameter heads.
Visor Platen - 6" x 1.5" (152.40mm x 38.10mm)