Personalized Green Ribbon Awareness T-Shirt. Green Ribbon Awareness T-Shirt - Vintage Black shows support for organ donation and transplant, leukemia, mental health issues, gastroschisis, bipolar disorder, cerebral palsy and environmental causes. Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.