BackTone 4000 - Small  
BackTone 4000 Small Fits waist size 50 - 85cm (20 - 34 inches) Suits adolescent or person with very slight frame and narrow shoulder/chest
$66.00

BackTone 4000 - Medium  
BackTone 4000 - Medium Fits waist size 60 - 100 cm (24 - 39 inches)
$66.00

BackTone 4000 - Large  
BackTone 4000 - Large Fits waist up to 132 cm (52 inches) Suits adult with broad shoulder/chest or tall person
$66.00