Octave Boys Thermal Underwear Short Sleeve T-Shirt/Vest/Top Fully brushed inside for extra warmth & softness. Ribbed fabric for added stretch and comfort. Body contouring guaranteed perfect fit. Excellent wicking rate draws sweat away from your skin. Cosy & warm but lightweight thermal material. Side seam free for added comfort. Easy care home machine wash at 40C. Maintains warmth even after many washes. Ideal arm length to avoid riding up the arm under layers while still remaining discrete.