KEEN. 1025585. BIG KIDS RIDGE FLEX WATERPROOF BOOT. BISON RED CARPET. What if every step could feel easier on family backpacking trips and longer day hikes Now everyone in the fam can benefit from our built-in flex design. Our waterproof hiking boot for kids pairs the trusted fit of our iconic hiker with our new KEEN.BELLOWS FLEX technology that reduces the energy each step takes -- giving kids hiking boot support without the stiffness. Flex easier hike happier go farther.