Freezer burn

Freezer Burn, as it is known throughout the UNSC, is an injury caused because of or from cryopreservation in the Cryo-chambers of UNSC ships. During the freezing and resuscitation process, cloth or other material next to the skin causes cellular damage, resulting in large welts or rashes on the covered areas, described as a making the skin "blistered and raw". Most UNSC personnel are stored in cryo either naked, or clothed and willing to endure the injuries. Spartans, for example, can be stored in cryo-preservation fully clad in MJOLNIR armor without the effects dulling their combat performance. It's not known if this is because they simply ignore the injury, or if the advanced materials mean that they do not suffer from it. Apparently Spartans are still checked for freezer burn, because in Reveille on The Pillar of Autumn level, one of the techs regards that Chief has no damage from the cryopreservation.