High Density Weights (超圧縮おもり Chō Asshuku Omori?) are developed and created by Mei Hatsume who won a competition for the best design.[1]


The weights are ultra-compacted to make them easy to wear around someone's arms or legs. They were used by U.A. teachers to reduce their speed and drain their stamina to give the students an advantage during final exams.[1] Each weight adds about a quarter of the wearers body weight.



  1. 1.0 1.1 My Hero Academia Manga and Anime: Chapter 61 and Episode 23.

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