Reversible Contoured Masks

What's the difference between the Reversible Contoured masks and the NEW 3-Layer Olson Masks?

 Reversible Contoured Masks: 3-Layer Olson Masks:
Available in one size only (adult average) Available in multiple sizes (S-XL)
2 Layers of 100% Woven Cotton 3 Layers of 100% Woven Cotton
Double Sided (reversible) Single Sided (not reversible)
Ear loops are adjustable and sewn-in, not replaceable
Ear loops are adjustable and easily replaceable
Nose wire is sewn-in/permanent Removable nose wire!
Filter pocket (for an optional 3rd layer)
Filter pocket (for an optional 4th layer)