ECWCS Gen III Mid-Weight Underwear Bottoms (Level II)

Rothco's ECWCS Gen III Level II Mid-Weight Underwear Bottoms are the foundation of any serious cold-weather layering system. Part of the Extended Cold Weather Clothing System (ECWCS), these thermal grid-fleece bottoms were designed for military use and work just as hard in hunting camps, backcountry elk camps, and late-season stands where staying warm means staying out longer.

Made from a 93% polyester / 7% spandex mid-weight grid fleece, they wick moisture away from your skin and dry quickly so you stay comfortable even during active days in cold conditions. Anti-microbial, anti-odor treatment keeps you fresh on multi-day hunts. The 4-way stretch construction allows full range of motion for hiking, climbing, or kneeling in a blind, and the flat-lock seams prevent bunching under hunting pants or waders.

Whether you're layering for a January whitetail sit, a high-country elk hunt, or any extended cold-weather outing, these bottoms are a proven base layer choice trusted by hunters and outdoorsmen alike.

Hunter-owned. Genuine name-brand gear. Ships in 3–5 business days.