Core Ribbed Tank Dress 7DIAMONDS Core Ribbed Tank 7Diamonds 7DIAMONDS Core Ribbed Crop Tank 7Diamonds 7DIAMONDS Core Ribbed Crop Tank 7Diamonds 7DIAMONDS Core Ribbed Crop Tank 7Diamonds 7DIAMONDS Core Ribbed Crop Tank 7Diamonds. Our Core Performance Collection combines our signature 4 Way Stretch fabric with a softer than ever finish that allows for all around comfort in or outside the house. Look good and feel good at your next workout session or morning hike. Details: Care: Machine wash cold with similar colors. Tumble dry low. Iron on low if needed. Composition: 81% Polyester 15% Lyocell 4% Elastane