USAF Type F-1B Extreme Cold Weather Flight Trousers - Used

USAF Type F-1B Extreme Cold Weather Flight Trousers - Used

The Type F-1B Extreme Cold Weather Flight Trousers (officially designated as Trousers, Extreme Cold Weather, Type F-1B) are high-altitude, sub-zero defense pants engineered specifically for U.S. Air Force flight crews and static ground personnel. Purpose-built to function at mean monthly temperatures below 14°F (-10°C), these high-waisted overpants act as an impenetrable insulation system. They are designed to be layered comfortably over standard uniform trousers, offering maximum defense against bitter winds and biting frost without causing structural bulk.

Constructed with a wind-resistant cotton and nylon heavy-duty Oxford outer shell, the F-1B is stuffed with a thick, high-loft polyester batting insulation that effectively captures and seals in passive body heat. Built to a strict military layout (MIL-T-6284), these pants are detailed with dual-angle utility pockets, integrated suspender button anchors, and a uniquely tailored high-back rise to protect the kidneys and lower spine from drafting wind.

This specific National Stock Number is custom-patterned for a Size 38 Waist. Because these are designed to be worn over pre-existing clothing layers (similar to a pair of fishing waders), they are built with an inherent oversize margin to track perfectly over your baseline clothing profile.

In Used military surplus condition, these trousers carry authentic character from airbase or hangar deployment. All items are professionally inspected to guarantee full operational serviceability. While they will display standard signs of vintage field service—such as light cosmetic fabric scuffs, minor storage discoloration, or faint thinning of the external water-repellent finish—all heavy-duty zippers, pocket enclosures, and seam lines remain fully intact and field-ready.

Technical Specifications & Features

• NSN: 8415-00-394-3615 (Explicitly assigned to Type F-1B Trousers, Size 38).
• Condition: Used (Authentic military surplus; fully tested for functional zippers and structural insulation integrity).
• Color: Official USAF Sage Green (Shade 1509).
• Size: 38 Regular (Fits a 38-inch waist over baseline uniform trousers).
• Material Construction:
• Outer Shell: Heavy-weight, wind-defying 80% Nylon / 20% Cotton Oxford weave.
• Insulation Core: 100% High-Loft Polyester fiber batting.
• Internal Lining: Smooth, high-density Cotton Twill.
• Design Features:
• High-Waisted Wader Cut: The torso panel extends high past the natural waistline up toward the navel to seal out drafting air, complete with an adjustable fabric buckle-and-strap back tab to custom-tighten the fit.
• Heavy-Duty Leg Outseam Zippers: Fitted with robust slide-fastener zippers extending from the knee down to the ankles, enabling the operator to rapidly don or doff the pants without stripping off bulky combat boots.
• Elasticized Rib-Knit Cuffs: Interior ankle bands feature built-in elastic cuffs that hug the lower shin, creating a draft-free seal to lock out snow, sleet, and freezing air.
• Reinforced Stress Patches: Heavy-duty double-layered fabric patches are cross-stitched directly across the seat and knees to survive heavy kneeling, sitting, and abrasive mechanical work.
• Four-Pocket Matrix: Two front pass-through slash pockets (allowing instant access to your inner uniform pants) paired with two rear hip pockets, all secured with heavy-duty snap flaps.
• Suspender Button Points: Built-in anchor loops permit the direct button-on attachment of standard tactical elastic suspenders (Note: Suspenders are not included).
• Authenticity: Genuine United States Air Force (USAF) Issue / Sourced from legacy Defense Logistics Agency (DLA) apparel contracts.

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