The FXR Youth Pyro Thermal Set delivers lightweight warmth and comfortable cold-weather layering with a soft 180gsm brushed microfleece construction. A polyester / spandex blend provides flexible comfort, while synthetic yarns help repel water and dry rapidly during active use. The athletic fit enhances moisture wicking and keeps the set close to the body for efficient performance under outerwear. Contrast and tonal flat-lock seams create a smooth, streamlined feel against the skin, while thumbhole cuffs help keep the sleeves securely in place. A longer top length helps reduce midriff exposure during movement, and tapered ankles minimize bulk under outer pants and inside boots. Debossed and woven label logos complete the design.