VIVAIA Cristina Sneakerina Square-Toe Lace-Up Mesh Ballet Flats Size EU37/US 6.5 These are brand new in original box. They are EU size 37, which is a US 6.5 according to their website. Step into the ultimate viral trend with these authentic VIVAIA Cristina "Sneakerina" ballet flats. This unique hybrid silhouette pairs an ultra-breathable, open fishnet mesh upper with a sporty sneaker-style rubber traction outsole and a generous, comfortable square toe box.Featuring a delicate lace-up closure styled with oversized, sheer organza ribbon laces for a stunning, romantic coquette finish. Inside, a plush, contoured foam footbed provides structured arch support and a bouncy heel patch to completely eliminate friction blisters. They retail for $159.