Phase Series: Moisture wicking base layer for interval activities. SV: Severe Weather. Employs the most durable materials for prolonged use and provides the most weather protection in the harshest weather conditions. Our warmest weight base layer zip neck in the Phase family, ideal for cold days in the alpine, this super wicking base layer has mid level insulation to keep you warm and dry, and a zip neck allows fast venting. Hybrid mapping of PhasicTM SV in the body and PhasicTM AR in the underarm area fabrics, in addition to the flatlock construction and comfortable next to skin fit, eliminates excess bulk and rapidly transfers moisture for efficient evaporation. Engineered for superior moisture management and rapid dry times during stop and go activities, this form fitting top keeps the user drier 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: 110 g 3.9 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.