Climb to the highest peaks with the versatile and dependable Quantum by Five Ten. ; Synthetic Clarino upper that has no stretch so it keeps it shape and you stay comfortable. ; An all-around performance shoe for steep, overhanging routes, bouldering, and long climbing sessions. ; Ariaprene tongue conforms to the foot and is perforated for added breathability. ; Features a new last that has a downturned toe and is a bit wider than their traditional downturned lasts, allowing your foot to sit in a more natural position. ; Speed lace closure system ensures a snug and secure fit. ; 4.2mm Stealth C4 rubber outsole versatile compound that's allows climbers to stick to barely-there edges, lock into smears on micro cracks, and cruise technical terrain. ; Stiffness: Stiff. ; Imported. Measurements: ; Weight: 8 oz ; Product measurements were taken using size 10.5, width D - Medium. Please note that measurements may vary by size.