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Fiberglass batts are a solid piece of soft spongy material. I use Johns Manville Fiberglass Batt
Insulation. 
- Improves indoor air quality - because it's made without formaldehyde.
- Thermally efficient - provides effective resistance to heat transfer with R-values up to R-38 (RSI-6.7).
- Controls sound - reduces transmission of sound through exterior and interior walls and floor/ceiling assemblies.
- Fire-resistant and noncombustible
- Noncorrosive - does not accelerate corrosion of pipes, wiring or metal studs.
- Mold-resistant - does not support mold or mildew. Does not supply a food source for insects or rodents.
- Resilient - bonded glass fibers will not pull apart during normal applications and resist settling, breakdown and sagging from vibration.
- Flexible - forms readily around corners and curved surfaces.
There are various types of fiberglass batts:
barrier on them. This is the most common form of fiberglass. It is used in new
construction homes where no vapor barrier is required and existing attics, where it is laid in place.
Kraft Faced fiberglass has a paper vapor barrier facing on one side enabling it to be stapled in place;
FSK Foil Faced fiberglass batts have a flame resistant facing 
on one side, so it can be stapled in place and not have to be covered by drywall.
This is usually used in garages where the homeowner does not want to drywall after the insulation is installed.
Comfort Therm fiberglass batts are encapsulated in a thin plastic sack perforated with small holes on one side.
Fiberglass will melt but not burn. Fiberglass comes with a warning label on each package stating that it is a possible carcinogen. Fiberglass does cause irritations if the particles come in contact with the eyes or skin.
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