Details Evolutionary improvement of B550SM, B650SM is the newest member of the Goodyear welted Hard As Nails family. Wider fitting than standard toe cap on Goodyear welted styles. Comes with a dual thickness rubber scuff toe. Fitted with K3 rubber sole providing maximum (SRC) slip resistance. Suggested Sector Use: Agriculture, Construction, Engineering, Maintenance and Trades. Heat (300ºC) Resistant Rubber Outsole. Oil Resistant Rubber Outsole. Steel Midsole. Steel Toe Cap. Available Sizes 6/40-13/47.Please click to view Testimonials. Buckbootz B650SM Honey Nubuck Leather Goodyear Welted Safety Boot SB P HRO SRC