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. The Phase SV is a men's base layer ideal for high output activities in cooler temperatures. PhasicTM SV and AR are composed of multi dimensional polyester yarns that wick laterally and dry quickly. The Phase SV Zip Neck Top from Arc'teryx is designed as a next to skin layer that rapidly transfers moisture and improves temperature regulation through its construction. The men's Phase SV Zip Neck Top eliminates funky smells with silver ion encapsulated for 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 Flatlock construction improves next to skin comfort 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: 170 g 6 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.