Sansha Pro 1C Canvas Split Sole Ballet Slippers - White

They are very comfortable and look very nice

This fit great. I have wide feet and prefer my shoes a little snug. I wear a street shoe of 11.5. I use sansha 14w and they take about two weeks to wear in but are great after that! Any bigger and they would have too much material.

I had to have black ballet flats for my (non-dancer) 16y.o. son who had an "extra" role in our studio's production of Peter Pan. He wears a men's shoe size 15 width 9E. (Thats like an XXXXW). The size 20 wide in these shoes actually worked for him. No other brand came big enough.
Also, he wore them for about 4-6 hours of rehearsals weekly from January to May...and by production, they were getting holes. But we colored the white liner (which was showing) with a black sharpie and from the audience you couldn't tell. I probably shoulda bought a new pair for the show, but since he's not a dancer, they would never get used again.
These shoes are great for beginning dancers with wide feet. But my more skilled dancers don't like the teardrop shape of the foot pad, because when they point, the tip of the teardrop pokes them in the arch.

Great arch support- they show off my feet beautifully. Love the quality of these shoes! I can that they are going to last for a long time.

My 15y.o. son is performing as an extra pirate in our Peter Pan ballet production. He has HUGE feet (wears a street shoe size 15, 9E width!) Based on the size chart and a couple other reviews, I ordered the size 20W for him (1 size larger than the size chart, because he has super wide feet). And they fit! I was very relieved, because that is literally the largest size. He's not a dancer, so long-term wear is not an issue for him. But my 18y.o. son also used to wear this shoe. They wear well, but he did not love the teardrop shape of the toe pad--it pokes him when he points.