The Type IIIa Environmental Suit, also known as the Environmental Suit Type IIIa, Type IIIa EV Suit, and the Starfleet Standard Issue Extra-vehicular Work Garment Type IIIa, is a prototype environmental suit, that is visually identical to its predecessor. A full load out of the Type IIIa Environmental Suits, was assigned to the USS Prometheus for field testing. (Star Trek: Prometheus)
The EV suit was made as one full piece that closed via a re-usable nano-molecular bonding strip. The suit (Unlike the type III EVA suit) was self-sealing, meaning that if it were punctured or damaged in some way, sealant would be automatically applied to prevent the suit from decompressing. Although the suit was solid enough to protect its wearer from the rigors of space, a hypospray could still penetrate it in case of an emergency. Even with the heavy padding and protection, the suit could only protect its wearer against a neutronic wavefront for one hour.
The helmet was smaller than its 22nd century counterpart but retained the clear and unopenable visor. Inside, two ambient lights were present on each side of the helmet to illuminate the wearer's face. Audio equipment, like a microphone and speaker, are integrated. Padding within the helmet made sure the wearer can not touch his/her face to the visor.
The life support unit consisted of a hard upper-torso body-shell, which was came in a variety of configurations for different body types. This unit contained the essentials for survival: communication equipment, oxygen, EV controls, power supply, and again an extra oxygen hose that made it possible to share oxygen. Alerts were available visibly via the color-coded EV controls and also by audio.
The gloves had five digits and were connected to the EV suit via a self-sealing nono-molecular bonding mechanism.
The boots were made out of the same material as the EV suit and could be magnetized.
The Type IIIa Environmental Suit possessed a single micro-thruster located on the rear of the life support unit for propulsion in the direction the wearer is facing. For headings other than directly ahead the wearer must change the orientation of their body.