A climber's footwork strongly determines the level at which they climb, and a properly fitting pair of rock shoes allows you to stand on the thinnest of edges with confidence. Climbing shoes and rubber preferences vary amongst climbers, and choosing the proper shoe for yourself has the greatest potential affect on your success at the crag or in the gym.
Lace-up climbing shoes evolved from lace-up boots to lace-up high tops to the lace-up shoes of the present. Across climbing history, laces have proven their worth.
Laces provide a snugger fit from ankle to mid-foot to the toes. Many prefer this style for that sure-fit and reduced risk of the foot slipping within the shoe.
Many lace-up shoes appeal to the outdoor climber who anticipates long hours in their shoes and choose to have a less aggressive feel and a more comfortable flat shoe.
However, do not be misled. Lace-up shoes can also come with an aggressive profile, which many boulderers and sport climbers prefer in order to send their project.
The down side to lace-up shoes is the extra 1-2 minutes it takes to put them on for every climb. If you plan to take shoes on and off regularly, lace-ups may not be what you want.