The Allegheny EXP is the warmer, 330 gm big brother to our popular Allegheny bottom.  The Allegheny EXP is 35% heavier than the regular Allegheny and more wool equals more warmth and comfort.  The Allegheny EXP is the ultimate first layer in your cold weather hunting kit.  Once the leaves are off the trees, these heavyweight bottoms will provide warmth, breathability, and odor control all day long, day after day.