I have found those pipes in my basement. I hope its fiberglass, but not sure if its asbestos, because it got placed in the 60's or 70's (in my country the use of asbestos got banned in 2005). These
Air Sealing Before Insulation, Adv. Home Energy
SmartFOIL- 4ft x 125ft Industrial Grade Radiant Barrier 500 sq. ft
There are a few pipe elbows in my basement that are wrapped with
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uxcell Insulation Sheet, 3meterx0.5mx5mm Self-Adhesive Embossed