Duofold is expanding beyond cold temperatures by offering Varitherm Silk Weight Dir-release. These light weight single-layer poly/cotton blended styles can be worn during cool weather and can transition into the warmer climates for 365 days of protection. Features: Light weight base layer for 365 day protection - great for all seasons. Dri-release technology dries over 2.5x faster than 100% cotton. Front fly and wicking elastic waistband for moisture control.