HARKILA Base Active Long Sleeve Undershirt - Mens - Dark Willow GreenHARKILA Base Active Long Sleeve Undershirt Mens Dark Willow Green The Harkila long sleeve Base Active undershirt is warm and quick drying, and excels as a base layer for active hunting and outdoor leisure activities, whether its just cool outside or genuinely cold. O neck Dot pattern zones with extra moisture wicking properties Active fit