The Chelsea Evolution BRZ has a breathable abrasion resistant polyester mesh upper and a non-marking slip and abrasion resistant EXTRALIGHT outsole for all day comfort and protection.Breathable Abrasion Resistant Polyester Mesh upper with TPU welded overlaysMolded TPU toe bumperMolded heel overlayMoisture wicking & breathable air mesh liningAluminum safety toeMetal free nail penetration protectionOrtholite Footbed - lightweight breathable & provides long lasting cushioning & moisture managementXL EXTRALIGHT Outsole with HellyGrip Rubber pods is lightweight & durable while offering outstanding cushioning.Safety Midsole: Non-Metallic Puncture Resistant Plate made out of many layers of textile that are stacked in a criss cross pattern layered with glue and pressed together