Merrell Flex Insole System Technology (F.I.S.T.)
Flex - Six specific grades of flex to precisely match the design
requirements of each boot, from stiff mountaineering flex to softer hiking/trail
flex.
MOUNTAINEERING
BACKPACKING
BACKPACKING
BACKPACKING / HIKING
LIGHT HIKING / TRAIL
WOMEN'S LIGHT HIKING / TRAIL
SPEED HIKING
