The FXR Men's Tenacious Merino Longsleeve delivers premium warmth, moisture management, and next-to-skin comfort for cold-weather layering. Built from a mid-weight 200gsm premium knit with 80% Merino content, it provides excellent warmth even when wet while naturally offering antibacterial and anti-odor properties. The contour fit enhances moisture wicking and supports rapid drying, while maximum anti-pill and anti-static performance helps maintain comfort through repeated wear. Tonal flat-lock seams create a smooth, streamlined feel against the skin, and thumbhole cuffs add coverage while helping keep the sleeves in place. An extended body length reduces midriff exposure when moving or layering, while screen printed logos and Thermal weld accents complete the technical design.