Size US4 (5.5W) US4.5 (6W) US5 (6.5W) US5.5 (7W) US6 (7.5W) US6.5 (8W) US7 (8.5W) US7.5 (9W) US8 (9.5W) US8.5 (10W) US9 US9.5 US10