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. Arc teryx s 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 Durable Quick drying Minimal odour retention Hydrophobic materials will not absorb water Mechanical stretch textile for unrestricted mobility Anatomical shaping for fit and comfort Gusseted underarms Laminated chin guard Quick pull 12 length zip for easy venting Long sleeves Non chafing label Next to skin Fit Weight: 145 g 5.1 oz Activity: All Round Materials: PhasicTM AR 87% polyester, 13% polypropylene, UPF 50, 145 gm . Double knit textile with mechanical stretch composed of multi dimensional 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. The smooth outer face is durably pill resistant and a lightly lofted interior adds light insulation. PhasicTM SV 92% polyester, 8% polypropylene, UPF 50, 150 gm . Double 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. The interior fabric is a combination of polyester and polypropylene and slightly lofted for mid level insulation, while the face is 100% polyester, smooth and durably pill resistant.