The Tingley 16" rubber metatarsal boot is flexible and comfortable in the toughest of work environments. Rubber metatarsal boots are often worn on uneven terrain which can lead to ankle injuries. Tingley has designed an internal support system in the critical areas of the heel and ankle to help mitigate the occurrence of injuries. Meets ASTM F 2413 M/I/75/C/75 Mt75 PR EH for steel toe impact and compression, metatarsal impact, puncture resistance, and electrical hazard protection. The MB816B is made of ozone resistant rubber to reduce premature cracking and provide flexibility while bending, kneeling, and crawling. You can be confident you will have comfort protection while wearing these boots with sure grip cleated outsoles that have excellent abrasion and slip resistance and contour polyurethane insoles that absorb moisture and shock. Ideal for mining, manufacturing, and construction.