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 crew neck in the Phase family is appropriate for cool temperature, high output activities. Composite construction of PhasicTM SV and PhasicTM AR fabrics, in addition to the textile s construction and next to skin fit, eliminates excess bulk and rapidly transfers moisture for efficient evaporation. Benefits include improved temperature regulation and layering possibilities. Features: Moisture wicking Breathable Durable Quick drying Minimal odour retention 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 Breathable fabric sections under arms Anatomical shaping for fit and comfort Gusseted underarms Crew neck Long sleeves Non chafing label 50 UPF rating Next to skin fit Weight: 155 g 5.5 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.