Turbo Mega-Flow Mask MEDIUM = 5'4" TO 6'4". 
INCLUDES: Mask with adjustable head strap.  You will need TWO ten foot BAG TO MASK hoses for each O2 face mask for oxygen concentrators. Buy as many in the cart as you need for $20.00 each 

Small  
Turbo Mega-Flow Mask SMALL= 5'3 AND BELOW.
Mask with adjustable head strap.  You will need TWO ten foot BAG TO MASK hoses  for each mask. Buy as many in the cart as you need for $20.00 each 

Large  
Turbo Mega-Flow Mask Large = 6'5" Tall and Up
Mask with adjustable head strap.  You will need TWO ten foot BAG TO MASK hoses  for each mask. Buy as many in the cart as you need for $20.00 each