Army Rangers, Marine Force Recon, Army Special Forces and Navy SEALs successfully evaluated the Block 0 uniforms in Alaska in August, 2002. When the Block 1 system was officially fielded in 2006, PCU had been upgraded several times, and a vest was added to the extreme cold level. Any operators in the field between the years of 2002 and 2006 wearing PCU were part of the trial run, and their comments and critiques were incorporated into Block 1.
Patagonia, La Sportiva and Malden Mills.
Other companies that have in the past or currently manufacture the various levels of PCU include:
Blackhawk Industries, Insport, Patagonia, Propper, Ready One and Steps Inc.
The Protective Combat Uniform includes a compressible fleece jacket made of no-rip, velour-backed Polartech Thermal Pro four times as warm as cotton.
Softshell jackets and pants moderately water-resistant and stretchy, maximally breathable
Mystery Ranch Big Ds Special Blend a 7,400-cubic-inch backpack, carries plenty of gear.
Multi-Climate Protection System base layer traps heat and wicks moisture.
Patagonia Flash Pullover has lofted pillars for insulation
Arc'Teryx Alpha SV Jacket features XCR, the best form of Gore-Tex, but it's too noisy and not breathable enough for soldiers.
Marmot ATV Pants feature 3XDRY, a fast-drying, stretchable nylon.
Lowa Biomex Vertex uses a flexing plastic cuff to combine big-boot stability and sneaker comfort.
Outdoor Research's Modular Glove System is good for skiers and soldiers alike.
Patagonia R.5 Superfly Tights and Top base layer insulates as well as the soldier gear does.
Patagonia Houdini Jacket
The North Face Superhype Jacket