The Under Armour Women's HeatGear Long Sleeve Shirt is another top-rated casual base layer top on Amazon. Designed with the brand's innovative HeatGear technology, this shirt wicks away sweat and keeps you cool and dry during workouts or everyday activities. It has a fitted silhouette and long sleeves, providing a comfortable and stylish fit. The shirt is made from a blend of polyester and elastane, offering stretch and flexibility. With its excellent ratings and positive customer feedback, the Under Armour Women's HeatGear Long Sleeve Shirt is a reliable choice for women seeking a high-quality base layer top.