Muscle Fiber Density
Boosted Muscle Fiber Icon
Gene Mod
Type Legs
Alt. Choice Adaptive Bone Marrow
Boosted Muscle Fiber

Muscle Fiber Density is one of the Gene Mods in XCOM: Enemy Within.


Confers superhuman leg strength, enabling the soldier to reach high positions without the need for ladders or other climbing aids.


This Gene Mod is unlocked after completing the Thin Man Autopsy research.

Cost: §60, XComEW Meld symbol small25


  • Muscle Fiber Density allows a soldier to reach elevated positions without the need of climbing aids. Indirectly it allows a soldier to travel further especially in alien ships when there are many elevated positions.
  • The gene mod is especially useful for Snipers with Squadsight to move into elevated firing positions. The gene mod is also useful for soldiers to enter into elevated cover in order to reduce the chances of getting hit by an enemy.
  • In Covert Operations, this gene mod is recommended with a Sniper at Colonel rank with Low Profile and Mimetic Skin; this combo also proves extremely useful as most missions have high points and high cover.
  • A Sniper with this, Depth Perception, Damn Good Ground and Squadsight can make the most of getting into and using elevated firing positions to their most maximum effect. For even more aim, a S.C.O.P.E. and Mimetic Skin when entering elevated cover works extra well.
  • Jumping 2 stories in a single move will grant the "Mind the Step" achievement. This can be done, for example, from the ground to the roof of a tall building.

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