I am a 38D and have the hardest time with strapless bras.  They are so uncomfortable that when I did plan to wear something that required one, I would count the hours that I would be in a strapless bra.  If it was over 5 hours, I'd pick a different outfit.  Well, I no longer have to worry about having a back-up outfit!  The Sassybax bra is amazing.  It offers great support and is so comfortable I can wear it the entire day.  I used this bra throughout a horrible heatwave (70+ days over 100!) and the fabric is breathable and comfortable.  I have recommended this to all my friends and they are pleased as well.  Great purchase!