Scalloped top-line design to accommodate flexing in the calf area to reduce irritation as well as graduated boot heights that are consistent with shoe sizes for better fit and comfort, unique Trac10 sole design enhances traction and durability with an ergonomic frame design and interior lugs, contour heel cup molding reduces heel slippage while the EVA foot form provides sneaker-like comfort for all-day wear. Steel toe meets ASTM F2413-05.