A compress is a type of medical application meant for areas that are strained.

During the war economy in 2014, various soldiers, including Solid Snake, utilized a brand called Arsenal Compress that was applicable to the lower back. It contained several nanocolloids to relieve lower back pain, and was manufactured by JEA. Owing to its name, it featured the Arsenal Gear on its packaging art.

Behind the scenes

Compress is an item in Metal Gear Solid 4: Guns of the Patriots. Using it will increase psyche and also relieve back pain, which occurs sometimes if the player performs a roll. During the Act 3 briefing, while Snake was in the bathroom, the player can use the Metal Gear Mk. II to retrieve a Compress from the toilet.

In-game description

" A compress applied to the lower back.

Contains nanocolloids that relieve lower back pain caused by crouching for long periods of time.
Manufactured by JEA.

The relief it brings has the added effect of temporarily restoring Psyche.

You’ll also make less mistakes when rolling, due to decreased Psyche.
―Compress description in Metal Gear Solid 4: Guns of the Patriots

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