Magpul
Hard-shell polymer sleeve over a stainless-steel heat shield. Magpul claims the cover surface runs up to 1000°F cooler than the bare can.
Magpul's MAG781 is the answer to a question fabric covers cannot solve: what do you put on a can that runs full-auto or sustained semi-auto fire? Fabric covers, even Kevlar ones, eventually fail above ~180 rounds of M855 sustained. The MAG781 is a heat-resistant polymer outer sleeve over a stainless-steel heat shield, hose-clamped to the can. Magpul's spec sheet claims a 1000°F surface-temperature reduction versus the bare suppressor.
The trade-off is fit. The MAG781 ships in exactly one configuration: 5.5" length, 1.5" outer can diameter. It works on most standard 5.56 cans (SilencerCo Omega 9K class, HUXWRX FLOW 556 family, KAC PRT family) and nothing else. Buyers with .30-class or .50-class cans should look at MODTAC's rail-mount shield or the Liberty StraightJacket instead.
At 9.6 oz, it's the heaviest option here, but that's the cost of a rigid heat-shield approach rather than a fabric wrap. If you run sustained-fire AR work and you've already gone through a fabric cover or two, this is the upgrade path.
Add the Magpul Suppressor Cover 5.5" (MAG781) to your build and see how it enhances your platform.