New 7DIAMONDS Core™ Crew Neck Tee In Black Size 3X Size 3X Retail $40 The Core Tee will be your most functional and sustainable tee, doubling as your new go- to-t-shirt. With premium fabric and comfort, this performance shirt has 4-way stretch, moisture wicking and quick dry abilities made with up-cycled fabric.  NWT and comes from smoke free home. No try ons, trades or holds.