The smooth, lightweight performance of the Phase SL Baselayer Top offers moisture-wicking performance and cool-weather performance for highly aerobic performance. Next To Skin Fit: & amp #8226 Snug fit increases the effectivity of performance fabrics. & amp #8226 Sized for a baselayer fit. & amp #8226 Gusseted underarm panels improve mobility. SL: Super Light uses ultralightweight materials, improving packing and wear while reducing bulk. Phasic interval system: & amp #8226 Offers varying benefits during the phases of interval training. & amp #8226 Stage 1 - Active/Wicking Phase: Hydrophobic Phi yarns wick moisture. & amp #8226 Stage 2 - Intense/Dispersion Phase: Phi yarns disperse perspiration across the fabric surface for thermoregulation. & amp #8226 Stage 3 - Rest/Drying Phase: High moisture dispersal for quick dry performance. Phasic SL: & amp #8226 Double-knit fabric features a special blend of yarns for improved performance. & amp #8226 Wicking yarns pull perspiration away from the skin. & amp #8226 Hydrophobic yarns limit total saturation to improve quick-dry performance. & amp #8226 DAO Durable Anti Odor silver-nitrate finish prevents bacterial growth. & amp #8226 2.9 oz/yd& amp #178 / 94 g/m& amp #178 fabric weight. Flatlock stitching for reduced friction. Crew neck. Long sleeves. Straight hemline. Reflective elements improve low-light visibility. 100% polyester. Machine wash and tumble dry. Imported. Measurements: Length: 29 in Product measurements were taken using size MD.