Vuori Halo Performance Crop - Copenhagen HeatherOverview Introducing the new Halo Performance Crop Tank 2. 0. Featuring an improved fit and our same DreamKnit performance fabric made from 89% recycled materials, this tank offers barely there comfort with a built in bra, racerback and light support. Moisture wicking 4 Way Stretch Made With Recycled Material Features Fit: Our signature DreamKnit fabric is an ultra soft brushed jersey Fitted; Form fits through chest and skims body at waist and bottom.