These crop top bras have thick enough straps so nothing digs into my shoulders. They are simply the most comfortable bras I have ever purchased. The band underneath the cups is thick enough that I don't fall out of them at the bottom. I heartily endorse these because they can be worn during the day and you can sleep in them too. I wear them while working out on the tredmill and eliptical machines, but would not for a bouncing aerobic workout. The cups stretch enough that I can wear a small even though my bra size is 32 D. I simply LOVE them.