NEW Men Size 11.5 Wide Keen Alloy Toe Waterproof Safety Work Boot Construction 100% Man Made Rubber sole Shaft measures approximately 6" from arch Boot opening measures approximately 8" around Alloy toe: left and right asymmetrical aluminum toes weigh 35% less Than steel and offer a sleeker appearance; The Seattle 6" Boots meet or exceed ASTM F2412 and F2413 M I/75 C/75 EH standards and wont weigh you down compared to traditional safety toes Traction: oil- and Slip-Resistant, Non-Marking, rubber outsoles are used for improved traction that meet or exceed ASTM F1677 Mark II and astm F2913 SATRA non-slip testing standards; lug sole patterns provide grip even on slick surfaces Waterproof: keen.Dry is a waterproof, breathable membrane liner that lets vapor out without letting water in for keeping your feet dry and comfortable; this boot does have a mesh liner that integrates with the waterproof membrane B513434