What Are the Difference Between SS Non woven Fabric and SSS Non woven Fabric?

First of all, let's introduce what S is:
S is spunbond nonwoven fabric, single S is single-layer spunbond nonwoven, SS non woven fabric is double-layer composite spunbond nonwoven, and SSS non woven fabric is three-layer composite spunbond nonwoven.
Do you know what the M in SMS non woven fabric means?

M is meltblown cloth, meltblown, medical mask is the structure of SMS, which is the composite meltblown, meltblown non woven is the core of mask filtration. Medical protective clothing also has the structure of SMMS. Pure meltblown, which means a single meltblown non woven. Disposable masks are a single layer of meltblown cloth + two layers of spunbond non woven fabric inside and outside. N95 masks are generally 3 layers of meltblown non woven composite + two layers of spunbond inside and outside.

Let's get to the point, what is the difference between SS non woven fabric and SSS non woven fabric?

In fact, the difference between double S and 3S is only in its thickness, and the thickness of SSS non woven fabric is slightly larger than that of SS non woven fabric.

They are both durable and disposable. Insulating and conducting. Softness and  stiffness. Fineness and  expansion. Isotropic and anisotropic. Filterability, breathable and impermeable. Elasticity, stiffness. Light, relaxed, warm. Thin as cicada wings, thick as felt. Waterproof and breathable. Ironing, sewing, moulding. Flame retardant, antistatic. Water-permeable, waterproof, wear-resistant, fleece. Wrinkle resistance, good elasticity, high moisture absorption, water repellency, which can be used in everyday items.