ECWCS Gen 3 Level VI Trousers, "New OCP," USGI/RFI Issue. 

Level 6 Trousers are generally considered to be the replacement for the "Old-School" Gore-Tex Trousers from the 1990s.  

These trousers are not heavily insulated -- they're meant to serve as a hard-shell wind/moisture barrier, on top of other insulated layers (Level 1-2-3).

Gen 3 Layer 6 Trousers in OCP are seam sealed through every stitch line, making them the package deal. The seam sealing process waterproofs and wind-proofs the garment while still ensuring breathability. By itself, it can take on moderate cold and wet conditions, but it thrives as part of a layered system. In that manner, the Gen 3 Level 6 is the hard-shell layer of your ECWCS and acts as the water barrier.

• OCP pattern (which replaced MultiCam in the 2010 timeframe)
• Extreme wet/cold weather
• Easy to pack
• U.S. military issue