Phase Series: Moisture wicking base layer for interval activities. SL: Super Light. Uses the lightest weight materials available to provide high weather protection, performances andor packability, but with the right amount of durability. Utilizing the lightest weight PhasicTM fabric, this half zippered, long sleeved top is engineered for optimal moisture management during stop and go activities. During active phases, moisture is wicked across the entire garment, aiding temperature regulation. When entering a rest phase, the broadly dispersed moisture evaporates quickly, speeding dry time to keep the user warm and more comfortable. Encapsulated silver ion fibres provide durable and long lasting odour control. Features: Moisture wicking Breathable Lightweight Quick drying Minimal odour retention Antimicrobial, odour control fabric treatment Hydrophobic materials will not absorb water Mechanical stretch textile for unrestricted mobility fabric is inherently stretchy without the use of Spandex fibres, making it more durable Flatlocked seams lie flat for added comfort Anatomical shaping for fit and comfort Gusseted underarms Collar zip for improved venting Long sleeves 50 Next to skin Fit Weight: 125 g 4.4 oz Activity: All Round Materials: PhasicTM SL 70% polyester, 30% polypropylene, UPF 25, 98 gm . Reduced yarn size of polypropylene lends soft touch to 100% hydrophobic jersey knit textile with mechanical stretch. Composed of multidimensional polyester yarns that wick moisture laterally to dry quickly, plus polypropylene yarns that have silver ion encapsulated into the fibre for long lasting odour control. Very light weight with a smooth outer face that slides easily under other layers.