|Duofold Youth Varitherm Mid Weight Long Sleeve Thermal Top - Black KMC5 fiber content is 96% Polyester / 4% Lycra elastane jersey. Duofold Youth Varitherm Mid Weight Long Sleeve Thermal Top - Black Features: Single-layer thermal for warmth in cold weather. Flatlock seams to avoid irritation. Bottom: Wicking elastic waistband for moisture control. Odor management, moisture control, and 360 degree stretch. previously 472A and 473B,/p>. Duofold Youth KMC5 comes with 1 Thermal Tops per Pack.