In the case of Northwave Typhoon SBS Cycling Shoes, what they aren't is almost as important as what they are. Northwave built the Women's Typhoon around a women-specific last to ensure proper fit and optimal performance for the serious female cyclist. The carbon fiber soleplate is much lighter than other, less costly sole materials. The Ultra Y heel counter envelops the heel and holds it firmly to eliminate heel lift. The SBS (Step By Step) ratcheting system provides stable closure that won't come undone or loosen up while you ride.