Arc'Teryx Men's Size Chart Designed for high output in cooler temperatures, the Phase AR Zip Neck is a men's midweight base layer top made from next generation Phasic(TM) AR. Engineered to provide insulation and offer performance stretch, Phasic(TM) AR uses different polyester yarn structures on its interior and face to rapidly wick and disperse moisture. The tall collar adds warmth, and the deep front zip provides ventilation. Lighter weight Phasic(TM) SL panels improve thermal regulation. Features: - Moisture-wicking - Breathable - Quick-drying - Mechanical stretch textile for unrestricted mobility - Merrow stitch seam construction reduces seam size - Flatlock construction improves next-to-skin comfort - Hybrid Mapping reduces bulk while improving thermal regulation - Next-to-skin fit aids thermal efficiency and moisture transfer - Anatomical shaping for fit and comfort - Collar Configuration - Tall collar with a deep zip neck provides warmth with rapid ventilation - Long sleeves - Non-chafing label - Alternate images do not reflect actual color - Only available to ship within the USA