Ronstan’s neoprene top uses a neoprene laminate that’s lightweight, windproof, water-repellent, quick-drying, flexible, and warm, so it’s comfortable in any weather. The athletic cut and high-stretch fabrics allow freedom of movement and the seamless underarm panel, non-chafing neoprene collar, and soft feel lining give even greater comfort. This garment has an excellent warmth-to-weight ratio. The 0.5mm neoprene is made with non-petroleum based material. Some sizes may be special order items.