Description: Soft fleece lining on the inside combined with a spandex outer layer makes this top not only warm but also water repellent. Smart technology alongside slim fit construction keeps you warm and comfortable even when wet. Can be used as a base layer during cold days or as an outer layer on warmer days. Bipoly Fabric - Bipoly is a double base layer for underneath your coastal gear or drysuit. It keeps its warmth function even after it gets wet. Inside layer - soft touch fabric - Soft brushed fleece lining to provide warmth and a soft layer directly on the skin. Bipoly can be used as a base layer or single outer layer during warmer days. Outer layer - spandex (stretch/UV50+) - Heavy quality nylon (soft touch) with spandex to provide substantial stretch. UPF sun protection of 50+ and quickdry feature. Water Repellent - The WaterBlocker fabric is ideal for the mild to cold climates as a base or single layer. This fabric blocks wind and water. It keeps the core warm allowing you to stay out longer. Materials: 88% polyester 12 % spandex Features: Lightweight and soft teddy lining Seamless High neck Quick drying for extra warmth and comfort Hydrophobic outer layer repels water Size Chart