(Muck Boot Company) The Excursion Hiker Boot gives outdoorsmen all the lightweight performance and 100% waterproof protection of Muck in a boot designed for outdoors lovers. Like all Mucks, the Excursion Field Boot provides lightweight, 100% waterproof, flexible performance time after time. It all starts with Muck's four-way stretch nylon CR flex-foam bootie and breathable air mesh lining. This foam bootie fits snugly and is comfort rated for 85ºF to sub-freezing temperatures for year round use. The lightweight rubber outsole is wrapped around the entire perimeter of the boot for top toe, heel, and arch protection and superior stability on uneven terrain and steep slopes.