Katy Perry - The Hollow Heel Slingback. Color Tranquil Blue. Low Stock. On sale for $81.31. MSRP $119.00.. 3.0 out of 5 stars2 left in stockBrand NameKaty PerryProduct NameThe Hollow Heel SlingbackGenderWomen'sColorTranquil BluePrice$81.31MSRP: $119.00