Ex-Stores Womens Thermal Wear Long Sleeve T-Shirt Top (Polyviscose Range) Polyester, Viscose, 1 x Premium quality thermal long sleeve t-shirt vest top. Matching pants available, search for UTTHERM120. Warm thermal wear. Fully brushed and side seam free. 50% Polyester and 50% Viscose for extra comfort, the thermals will mold around your body.