UK Sizes, NOT US Sizes. Irish dance shoes fit very differently to your American shoes so please be sure you know your size before purchasing as there are no returns for sizing issues. If you're not sure I would recommend checking the sizing chart on the Rutherford Shoes website. Virtually no break-in!!! Constructed with an Ultra-Lite Black Suede Sole for Easy Flexibility and Super Soft Leather. Fitted with the World Famous Rutherford Soundblaster Heels and Tips making these shoes the loudest and lightest Jig Shoe on the market today. Most popular with the advanced dancers but great for all. Truly the choice of Champions. Snug fit is best as they will stretch.