Our all-new wildland tactical firefighter blends the lightweight and supportive benefits of an alpine hiker with the stringent standards of a nfpa-certified boot to deliver the most effective wildland firefighting boot on the market today.How it fits:The 851 last is an update to our popular 850 last. This last fits true to size with an athletic and supportive fit while providing ample room in the toe. Offering a specific heel shape that locks the heel in place for better fit and comfort on the back end of the boot, this supportive fit is ideal for those needing high mileage performance from their gear.