| RefrigiWear Heavyweight Mid-Layer Bottom | Black | Ragg Wool/Polyester/Brushed | M. RefrigiWear Jackets | 240g 4-Way stretch base layer Stretch jersey knit with brushed lining for added comfort Closed fly This ain't your granddaddy's long underwear. Heavyweight Mid-Layers from RefrigiWear® give you added warmth for the coldest jobs and can help jackets, bib overalls or coveralls feel 7°F to 15°F warmer, depending on your activity. Build a foundation of warmth with layers to flex and move with you. Layer up with the Heavyweight Mid-Layer Bottom and Heavyweight Mid-Layer Top. 92%... - RefrigiWear Heavyweight Mid-Layer Bottom | Black | Ragg Wool/Polyester/Brushed | M. |