[4] In 1974, NII Stali started development of ZhZT-71M, a version that addressed several issues at once (like plates drifting inside the vest and being offset overtime).

It also had a new dampener layer 30 mm thick on the chest, and 10 on the back, made out of foam rubber Polyurethane.

Weight increased to over 10 kg, due to thicker 3.3 mm plates that were used to meet the requirements of stopping buckshot rounds from shotguns.

[3][1] it was used by Alpha Group personnel during operation to free the hostages of Aeroflot Flight 6833[1] ZhZT vest was still in service as late as 1990s.

[5] Protection was from 2.5 mm thick titanium plates, connected with one another by rivets, placed inside of pockets made out of Nylon 6.