The Difference Between Stealth Standard and PRO models.
Stealth Standard VS PRO models. What's The Difference?
Working in an office typically means spending a lot of time sitting down - this position can stress your spine. To avoid developing or compounding back problems, make sure you invest in ergonomic chairs that promote good posture and support lower backs. The most important things to look at when purchasing these types are height (most standard desks seat 17-20") and weight distribution; while people vary by their body weights & builds, they distribute themselves differently during use.
The Difference between Standard and Stealth PRO models is based on the user. Both models have the same features, benefits and come with everything you need to set up for your home, studio, stage, or other setups.
Stealth Standard VS PRO chair understanding the difference.

The most important things to ensure you get the correct seating support are Height and Weight.

Height: Most standard chairs have seats about 17 to 20 inches deep, too large for short people. This can cause unneeded pressure on the lower back and legs, reducing circulation. Also you want your knees lower than your hips but still firmly placed on the ground.

Weight: While people of different body weights and builds distribute their weight on a chair in similar patterns, they are different when it comes to pressure intensity. The more weight usually requires a larger seat from standard seating widths.
Standard Stealth Features
The Stealth Standard Task Chair is designed for Users Under 6′ or under 200 Lbs. The Smaller Seat than the pro allows for a more conforming fit for smaller users while tasking.
Width 18.5″ x Depth 16.75″
The standard stealth includes a smaller seat and smaller casters than the pro model.

For Users Under 6' Tall and/or Under 200 Lbs.
PRO Stealth Features
The Pro Stealth Model is designed for Users Over 6′ or over 200 Lbs. The Larger Seat than the Standard allows for a more conforming fit for users while tasking.
Width 20″ x Depth 19″
The PRO stealth includes a Larger seat and Larger casters than the standard model.
