Warm Underwear Knit Fabric 220GSM Lyocell Wool Rib 2x2 Stretch Jersey for Thermal Underwear Manufacturers Thermal underwear lines live or die on two things buyers rarely see on a spec sheet: whether the rib holds its memory after washing, and whether the next dye lot matches the last. A 2x2 rib with 4% spandex recovers better than single jersey at the waistband and ankle, and the 77/19/4 lyocell-wool recipe keeps the face smooth against skin so the garment does not read as