Bogs Women's Mattie Dahlia Boot 100% - Synthetic and neoprene Rubber sole Shaft measures approximately 4 1/2" from arch Boot opening measures approximately 8 1/2" around 100% Waterproof Natural hand-lasted rubber and a four way stretch inner bootie Non-slip, non-marking and self-cleaning outsole Removable molded polyurethane sockliner with Aegis anti-microbial protection. When removed allows enough room for most orthotics Comfort rated from temperate to sub-zero conditions