Fly London Yust Knee High Leather Boots Chamois Yellow Suede Lace up Detail on Back Round Toe Wedge Rubber Heel Inside Zip EU Size 40 = US Size 9 Good used condition. Some marks to suede. Please see photos. Yust, a knee high boot designed by Fly London. Yust features a smooth leather upper, chunky wedge heel, tooth style tread, Fly London Fly logo on outer heel, contrasting seam stitching, zip fastening on the inner side and a thick lace up closure on the back.