I was really surprised by these sports bras! I am a bigger/wide girl (think 40A in bra size) and was very hesitant about the One Size aspect. I received the sports bras, immediately washed and dried them, and then prayed before trying them on and they surprisingly fit! They are very comfortable and I wear them more as an everyday comfy bra as the straps are very thin and do not provide the support needed for a high intensity workout. They would work perfectly to wear daily or on a walk and maybe arm days. I would not wear these for heavy cardio as I wouldn't trust the straps.
Overall, I really like these bras so far!