Physical training uniform

The United States Army, Marines, Navy, and Air Force require use of a physical training (PT) uniform during unit exercise (including formation runs, calisthenics, and conditioning exercises).
Occasionally, exercise will be conducted in that branch's utility uniforms, normally with the blouse removed and the undershirt exposed (also known as "boots and utes").

Army

jackets in daylight conditions

The US Army currently uses the Army Improved Physical Fitness Uniform (IPFU), manufactured by UNICOR.
 It is essentially a tracksuit, marked with the ARMY name. Optional compression shorts (called "spandex" by soldiers) may be worn under the IPFU trunks provided they are black or do not extend past the trunks.
The main advantage of this new uniform over its older counterpart is being highly reflective at night while keeping its tactical colors during the daytime hours. The other noticeble advantages are more water- and windproof, and a bit lighter.

jackets in lowlight conditions

The Army physical training uniform consists of:

• T-shirt: Grey Army-marked long-sleeve or short-sleeve T-shirt; large reflective ARMY symbol on front of shirt and stylized reflective A on back. A Physical Fitness Badge may be worn for soldiers who excel at the A.P.F.T (270 or higher, with a 90 in each event).

• Trunks: Black trunks, multipurpose: can be worn alone for swimming, worn with longsleeve or shortsleeve shirt and under the black IPFU trousers.
• Trousers: Black trousers, lined with breathable, pored nylon fabric.
• Jacket: Grey jacket, zipped, with ARMY embroidered on left chest, and inverted (reflective) chevrons extending from shoulders to mid-stomach and lower back, with hidden vents in back and zippable hidden vents in armpits
• Socks: Commercial calf-length or ankle-length, plain white socks with no logos.
• Shoes: Approved, well-fitting, comfortable running shoes.
• Foliage green mircofleece cap and black leather gloves (with gray-green wool inserts) : optional for inclement weather. All of these items are issued to a soldier while in processing through BCT (Basic combat training) but replacements must be purchased from AAFES stores.

The following items that are still issued, but only worn during Initial Entry Training:

• Sweatpants: White sweatpants with ARMY down the left and right legs.
• Sweatshirt White with ARMY centered on the front chest. It used to be a hoodie with a zipper and draw string closure for its hood.

Due to its white nature, this uniform is referred to by the soldiers as the 'marshmallow suit.'
For unit runs, Esprit de Corp or special occasions, commanders may have soldiers wear t-shirts with the units Distinctive unit insignia and unit colors.


From : Wikipedia