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.
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Magpul Industries Suppressor Cover, Black, 5.5 in, MAG781-BLK
Magpul's MAG781 is the hard-shell alternative to a fabric suppressor wrap. 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 one of the heavier options here, but that's the cost of a rigid heat-shield approach rather than a fabric wrap. If you want a fixed-dimension hard-shell heat shield instead of a soft wrap, this is the mainstream option.
Add the Magpul Suppressor Cover 5.5" (MAG781) to your build and see how it enhances your platform.