Keen Men's Ridge Flex Mid Waterproof. What if every step could feel easier? Keen took the trusted fit of our iconic Targhee hiker and paired it with Keen's new KEEN.BELLOWS FLEX technology to reduce the energy each step takes. Flex easier, hike happier in our men's waterproof hiking boot. • Flexes Easier: The Ridge Flex, featuring KEEN.BELLOWS FLEX, requires 60% less energy to bend so each step feels easier. • More Durable: KEEN.BELLOWS FLEX bends where other boots crack and weaken over time. • For All Conditions: Ready for anything with KEEN.DRY waterproof protection and KEEN.ALL-TERRAIN traction for better grip on a variety of trail surfaces.