Dr. Martens Burham ST Work Boot 100% Full Grain Leather Imported Synthetic sole Shaft measures approximately 5.75" from arch Boot opening measures approximately 14.5" around From the Heritage Collection, the Burnham ST 6 Tie Boot is constructed using a process honed across fifty years of shoe-making, the Heritage Industrial range remains unique to Dr. Martens and is, quite literally, made like no other shoe on earth.