HeatGear Crop Mock Neck Top A performance base layer has never looked more stylish. The HeatGear Crop Mock Neck Top ($40) gives you coverage where you need it, HeatGear fabric to keep you cool, and features a trendy crop and mock neckline that's fashionable enough to wear as either a base layer or by itself. Image Source: underarmour.com HeatGear Crop Mock Neck Top $40 from underarmour.com Buy Now