Personalized Heart Disease Awareness butterfly T-Shirt. Heart Disease Awareness T-Shirt - Azalea walk gear has pretty red butterfly for support and awareness of those with heart disease. 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.